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SiBE041401E

Troubleshooting with LED

Service Diagnosis

54

2. Troubleshooting with LED

2.1

Indoor Unit

Operation Lamp

The multi-monitor lamp blinks when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor

malfunctions.

2. When a signal transmission error occurs between the indoor and outdoor units.
In either case, conduct the diagnostic procedure described in the following pages.

Service Monitor

The indoor unit has one green LED (LED A) on the control PCB. When the microcomputer
works in order, the LED A blinks.

2.2

Outdoor Unit

The outdoor unit has one green LED (LED A) on the PCB. When the microcomputer works in
order, the LED A blinks.

(R19930)

Multi-monitor lamp

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Summary of Contents for RXG20L2V1B

Page 1: ...Service Manual Applied Models z Inverter Pair Heat Pump Inverter Pair Wall Mounted Type L Series SiBE041401E ...

Page 2: ...Contents Inverter Pair Wall Mounted Type L Series zHeat Pump Indoor Unit FTXG20LV1BW FTXG20LV1BS FTXG25LV1BW FTXG25LV1BS FTXG35LV1BW FTXG35LV1BS FTXG50LV1BW FTXG50LV1BS Outdoor Unit RXG20L2V1B RXG25L2V1B RXG35L2V1B RXG50L2V1B ...

Page 3: ...ol for Indoor Unit 20 1 6 Program Dry Operation 21 1 7 Automatic Operation 22 1 8 Thermostat Control 23 1 9 NIGHT SET Mode 24 1 10 ECONO Operation 24 1 11 2 Area INTELLIGENT EYE Operation 25 1 12 Inverter POWERFUL Operation 27 1 13 Multi Monitor Lamp TIMER Lamp 27 1 14 Clock Setting 28 1 15 WEEKLY TIMER Operation 29 1 16 Other Functions 35 2 Function of Thermistor 36 3 Control Specification 37 3 1...

Page 4: ...r Overload 73 4 13 Compressor Lock 75 4 14 DC Fan Lock 76 4 15 Input Overcurrent Detection 77 4 16 Four Way Valve Abnormality 78 4 17 Discharge Pipe Temperature Control 80 4 18 High Pressure Control in Cooling 81 4 19 Compressor System Sensor Abnormality 82 4 20 Position Sensor Abnormality 83 4 21 DC Voltage Current Sensor Abnormality 20 25 35 Class Only 85 4 22 Thermistor or Related Abnormality O...

Page 5: ...rial Operation 106 3 Field Settings 107 3 1 When 2 Units are installed in 1 Room 107 3 2 Model Type Setting 107 3 3 Standby Electricity Saving 108 3 4 Jumper Settings 109 4 Silicon Grease on Power Transistor Diode Bridge 110 Part 8 Appendix 111 1 Piping Diagrams 112 1 1 Indoor Unit 112 1 2 Outdoor Unit 112 2 Wiring Diagrams 114 2 1 Indoor Unit 114 2 2 Outdoor Unit 114 ...

Page 6: ... Warning Do not store the equipment in a room with successive fire sources e g naked flame gas appliance electric heater Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for repair Working on the equipment that is connected to the power supply may cause an electrical shock If it is necessary to supply power to the equipment to conduct the repair or...

Page 7: ...2 in the refrigerant system If air enters the refrigerating system an excessively high pressure results causing equipment damage and injury Warning Caution Do not repair the electrical components with wet hands Working on the equipment with wet hands may cause an electrical shock Do not clean the air conditioner by splashing water Washing the unit with water may cause an electrical shock Be sure t...

Page 8: ...heat generation or fire Be sure to use an exclusive power circuit for the equipment and follow the local technical standards related to the electrical equipment the internal wiring regulations and the instruction manual for installation when conducting electrical work Insufficient power circuit capacity and improper electrical work may cause an electrical shock or fire Be sure to use the specified...

Page 9: ...conducted securely the equipment may fall and cause injury Check to make sure that the power cable plug is not dirty or loose then insert the plug into a power outlet securely If the plug has dust or loose connection it may cause an electrical shock or fire Be sure to install the product correctly by using the provided standard installation frame Incorrect use of the installation frame and imprope...

Page 10: ...thed grounded Improper earth grounding may cause an electrical shock Be sure to measure the insulation resistance after the repair and make sure that the resistance is 1 MΩ or higher Faulty insulation may cause an electrical shock Be sure to check the drainage of the indoor unit after the repair Faulty drainage may cause the water to enter the room and wet the furniture and floor Do not tilt the u...

Page 11: ...ion is used when there is danger that the reader through incorrect manipulation may damage equipment loose data get an unexpected result or has to restart part of a procedure Note Note A Note provides information that is not indispensable but may nevertheless be valuable to the reader such as tips and tricks Reference A Reference guides the reader to other places in this binder or in this manual w...

Page 12: ...SiBE041401E 1 List of Functions Part 1 List of Functions 1 Functions 2 ...

Page 13: ...to restart after power failure z Indoor unit quiet operation z Self diagnosis digital led display z NIGHT QUIET mode automatic Wiring error check function OUTDOOR UNIT QUIET operation manual z Anti corrosion treatment of outdoor heat exchanger z INTELLIGENT EYE operation z Flexibility Multi split split type compatible indoor unit z Quick warming function preheating operation z Flexible power suppl...

Page 14: ...SiBE041401E 3 Specifications Part 2 Specifications 1 Specifications 4 ...

Page 15: ...e Mildew Proof Removable Washable Mildew Proof Running Current Rated A 0 12 0 12 0 12 0 15 0 15 0 15 0 12 0 12 0 12 0 15 0 15 0 15 Power Consumption Rated W 23 23 23 31 31 31 23 23 23 31 31 31 Power Factor Rated 87 1 83 3 79 9 93 9 89 9 86 1 87 1 83 3 79 9 93 9 89 9 86 1 Temperature Control Microcomputer Control Microcomputer Control Dimensions H W D mm 303 998 212 303 998 212 Packaged Dimensions ...

Page 16: ...ew Proof Removable Washable Mildew Proof Running Current Rated A 0 12 0 12 0 12 0 16 0 16 0 16 0 12 0 12 0 12 0 16 0 16 0 16 Power Consumption Rated W 23 23 23 33 33 33 23 23 23 33 33 33 Power Factor Rated 87 1 83 3 79 9 93 8 89 6 85 9 87 1 83 3 79 9 93 8 89 6 85 9 Temperature Control Microcomputer Control Microcomputer Control Dimensions H W D mm 303 998 212 303 998 212 Packaged Dimensions H W D ...

Page 17: ...Mildew Proof Removable Washable Mildew Proof Running Current Rated A 0 16 0 16 0 16 0 21 0 21 0 21 0 16 0 16 0 16 0 21 0 21 0 21 Power Consumption Rated W 33 33 33 42 42 42 33 33 33 42 42 42 Power Factor Rated 93 8 89 6 85 9 90 9 87 0 83 3 93 8 89 6 85 9 90 9 87 0 83 3 Temperature Control Microcomputer Control Microcomputer Control Dimensions H W D mm 303 998 212 303 998 212 Packaged Dimensions H ...

Page 18: ...oof Removable Washable Mildew Proof Running Current Rated A 0 16 0 16 0 16 0 21 0 21 0 21 0 16 0 16 0 16 0 21 0 21 0 21 Power Consumption Rated W 33 33 33 43 43 43 33 33 33 43 43 43 Power Factor Rated 93 8 89 6 85 9 93 1 89 0 85 3 93 8 89 6 85 9 93 1 89 0 85 3 Temperature Control Microcomputer Control Microcomputer Control Dimensions H W D mm 303 998 212 303 998 212 Packaged Dimensions H W D mm 32...

Page 19: ...SiBE041401E Printed Circuit Board Connector Wiring Diagram 8 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Indoor Unit 9 2 Outdoor Unit 11 2 1 20 25 35 Class 11 2 2 50 Class 13 ...

Page 20: ...stor 4 S41 Connector for swing motors 5 S42 Connector for reduction motor front panel mechanism and limit switch 6 S46 Connector for signal receiver display PCB 7 S200 Connector for fan motor 8 H1 H2 H3 Connector for terminal board indoor outdoor transmission 9 FG Connector for terminal board frame ground 10 JB Fan speed setting when compressor stops for thermostat OFF JC Power failure recovery fu...

Page 21: ...peration may occur if you cut any of them INTELLIGENT EYE Sensor PCB A3P 1 S51 Connector for control PCB 2 S52 Connector for room temperature thermistor 3 S1W Forced cooling operation ON OFF button Refer to page 104 for detail 4 H1P LED for operation multi color 5 H2P LED for INTELLIGENT EYE green 6 JA Address setting jumper Refer to page 107 for detail S52 S51 S1W JA H2P H1P 3P357402 1 1 S36 Conn...

Page 22: ...overload protector 4 S50 Connector for magnetic relay 5 S70 Connector for fan motor 6 S80 Connector for four way valve coil 7 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 8 S100 Connector for forced operation button PCB 9 HL3 HN3 Connector for filter PCB 10 HR2 Connector for reactor 11 U V W Connector for compressor 12 FU2 Fuse 3 15 A 250 V 13 LED A LED f...

Page 23: ... for terminal board 3 E1 E2 Terminal for earth wire 4 HL2 HN2 Connector for main PCB 5 HR1 Connector for reactor 6 FU1 Fuse 3 15 A 250 V 7 FU3 Fuse 20 A 250 V 8 V2 V3 Varistor HR1 HL2 3P254234 1 FU1 HN2 S FU3 AC2 E1 E2 AC1 S11 V3 V2 to S50 on main PCB 1 S110 Connector for main PCB 2 SW1 Forced cooling operation ON OFF button Refer to page 104 for detail SW1 S110 3P255755 1 ...

Page 24: ...lectronic expansion valve coil 4 S40 Connector for overload protector 5 S50 Connector for magnetic relay 6 S70 Connector for fan motor 7 S80 Connector for four way valve coil 8 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 9 HL3 HN3 Connector for HL2 HN2 on filter PCB 10 U V W Terminal for compressor 11 FU2 Fuse 3 15 A 250 V 12 LED A LED for service monito...

Page 25: ...r terminal board 3 E1 E2 Terminal for earth wire 4 HL2 HN2 Connector for HL3 HN3 on main PCB 5 HL4 HN4 Connector for S12 on main PCB 6 FU1 Fuse 3 15 A 250 V 7 FU3 Fuse 30 A 250 V 8 V2 V3 Varistor 9 SW1 Forced cooling operation ON OFF button Refer to page 104 for detail to S50 on main PCB S HL1 HN1 V3 V2 FU3 SW1 FU1 HN4 HL4 HN2 HL2 S11 E1 E2 3P273862 4 ...

Page 26: ...eration 25 1 12 Inverter POWERFUL Operation 27 1 13 Multi Monitor Lamp TIMER Lamp 27 1 14 Clock Setting 28 1 15 WEEKLY TIMER Operation 29 1 16 Other Functions 35 2 Function of Thermistor 36 3 Control Specification 37 3 1 Mode Hierarchy 37 3 2 Frequency Control 37 3 3 Controls at Mode Changing Start up 39 3 4 Discharge Pipe Temperature Control 40 3 5 Input Current Control 41 3 6 Freeze up Protectio...

Page 27: ...is controlled by the following 2 parameters The load condition of the operating indoor unit The difference between the room thermistor temperature and the target temperature The target frequency is adapted by additional parameters in the following cases Frequency restrictions Initial settings Forced cooling operation Inverter Principle To regulate the capacity a frequency control is needed The inv...

Page 28: ...Once the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency Limits The following functions regulate the minimum and maximum frequency Forced Cooling Operation Refer to page 104 for detail Refrigerant circulation rate high high f low f freq variable Refrigerant circulation rate low high speed low speed R2812 Amount of heat exchange...

Page 29: ...tate when the flap passes over the fan banned area Closing the flap fully R20133 Fan operation starts at 300 rpm Fully open OFF Start ON Under running control Under operation mode control Under operation mode control Fan D Fully close Fully open Fully close ON 300rpm OFF Output ON 0 Fan banned area R20134 Front panel Power supply from the outdoor unit The outdoor unit provides force when it receiv...

Page 30: ...ing dry heating and fan 3 D Airflow Alternative repetition of vertical and horizontal swing motions enables uniform air conditioning of the entire room When the horizontal swing and vertical swing are both set to automatic operation the airflow becomes 3 D airflow The horizontal and vertical swing motions are alternated and the airflow direction changes in the order shown in the following diagram ...

Page 31: ... setting button is set to automatic Cooling The following drawing explains the principle of fan speed control for cooling The upper limit is M tap for 30 minutes from the operation start Heating In heating operation the fan speed is regulated according to the indoor heat exchanger temperature and the difference between the room thermistor temperature and the target temperature COMFORT AIRFLOW Oper...

Page 32: ...temperature at start up and the target temperature is divided into two zones Then the unit operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Room thermistor temperature at start up Target temperature X Thermostat OFF point Y Thermostat ON point Z 24ºC or more Room thermistor temperature at start up X 2 0ºC X 0 5ºC or Y 0 5ºC zone B co...

Page 33: ...temperature Ts determines the target temperature Tt Ts 18 30 C 2 The target temperature Tt is calculated as Tt Ts C where C is the correction value C 0 C 3 Thermostat ON OFF point and operation mode switching point are as follows Tr means the room thermistor temperature 1 Heating Cooling switching point Tr Tt 3 0 C 2 Cooling Heating switching point Tr Tt 2 5 C 3 Thermostat ON OFF point is the same...

Page 34: ...after being in the zone A The system resumes from defrost control in any zones except A The operation turns on in any zones except A The monitoring time has passed while the temperature difference is in the zone B Cooling Dry 10 minutes Heating 10 seconds Cooling Dry Heating Refer to Temperature Control on page 16 for detail B A OFF ON C Room thermistor temperature target temperature 1 5 C R12319 ...

Page 35: ...ajor bonus when breaker capacity does not allow the use of multiple electrical devices and air conditioners It can be easily activated by pushing the ECONO button on the wireless remote controller Detail When this function is activated the maximum capacity also decreases The remote controller can send the ECONO command when the unit is in cool or dry operation This function can only be set when th...

Page 36: ...or unit carries out a sampling every 20 msec and if it detects 10 cycles of the wave in one second in total and when the ON signal continues 3 sec it judges human is in the room as the motion signal is ON 2 area INTELLIGENT EYE sensor is divided into 2 areas and detects humans in each area The sensor may detect human motion with up to 20 msec latency Image of 2 area INTELLIGENT EYE 1 sec sampling ...

Page 37: ... and B Shift the airflow direction to area B left side 2 Detection signal ON in area A Shift the airflow direction to area B left side 3 Detection signal ON in area B Shift the airflow direction to area A right side 4 Detection signal OFF in both area A and B No change When the detection signal is OFF for 20 minutes in both area A and B the unit starts energy saving operation Note For dry operatio...

Page 38: ...Monitor Lamp TIMER Lamp Current operation mode is displayed in color of the lamp of the indoor unit Operating status can be monitored even in automatic operation in accordance with the actual operation mode Operation mode Fan speed Target temperature COOL H tap A rpm 18 C DRY Dry rotating speed A rpm Lowered by 2 5 C HEAT H tap A rpm 31 C FAN H tap A rpm AUTO Same as cooling heating in POWERFUL op...

Page 39: ...The clock can be set by taking the following steps 1 Press the CLOCK button is displayed and MON and blink 2 Press the SELECT or button to set the clock to the current day of the week 3 Press the CLOCK button blinks 4 Press the SELECT or button to adjust the clock to the present time Holding down the SELECT or button increases or decreases the time display rapidly 5 Press the CLOCK button to set t...

Page 40: ... 00 27 C 27 C ON OFF OFF ON Program 1 Program 2 Program 3 Program 4 The same timer settings are made for the week from Monday through Friday while different timer settings are made for the weekend Tuesday to Friday Use the copy mode to make settings for Tuesday to Friday because these settings are the same as those for Monday Up to 4 reservations per day and 28 reservations per week can be set in ...

Page 41: ...TIMER OFF TIMER blank 5 Press The day of the week and the reservation number of the current day will be displayed 1 to 4 settings can be made per day 2 Press to select the desired day of the week and reservation number The day of the week and reservation number will be set and blink Pressing changes or setting in sequence Pressing alternates the following items appearing on the LCD in rotational s...

Page 42: ...rvals To return to the ON OFF TIMER mode setting press Go to step 9 when setting the OFF TIMER The time will be set and the temperature blink The temperature can be set between 10 C and 32 C COOL or AUTO The unit operates at 18 C even if it is set at 10 C to 17 C HEAT or AUTO The unit operates at 30 C even if it is set at 31 C to 32 C To return to the time setting press The set temperature is only...

Page 43: ...nother day of the week The whole reservation of the selected day of the week will be copied Tuesday to Friday 2 Press to confirm the day of the week to be copied 4 Press to select the destination day of the week Be sure to direct the remote controller toward the indoor unit and check for a receiving tone and flashing the multi monitor lamp The reservation will be copied to the selected day of the ...

Page 44: ...EKLY TIMER operation Confirming a reservation The reservation can be confirmed Setting Displays Normal Confirmation 1 Press The day of the week and the reservation number of the current day will be displayed 3 Press to exit confirming mode To deactivate WEEKLY TIMER operation CAUTION 2 Press to select the day of the week and the reservation number to be confirmed Pressing displays the reservation ...

Page 45: ...onal sequence Selecting blank will cancel any reservation you may have The selected reservation will be deleted If there are still other reservations WEEKLY TIMER operation will be activated This function can be used for deleting reservations for each day of the week It can be used while confirming or setting reservations Be sure to direct the remote controller toward the indoor unit and check for...

Page 46: ...OFF button once to start operation Press once again to stop it The ON OFF button is useful when the remote controller is missing or the battery has run out The operation mode refers to the following table Forced cooling operation Forced cooling operation can be started by pressing the ON OFF button for 5 to 9 seconds while the unit is not operating Refer to page 104 for detail Note When the ON OFF...

Page 47: ...ature used in place of the inner temperature of the compressor rises abnormally the operating frequency becomes lower or the operation halts 2 The discharge pipe thermistor is used for detecting disconnection of the discharge pipe thermistor 3 Indoor Heat Exchanger Thermistor 1 The indoor heat exchanger thermistor is used for controlling the target discharge pipe temperature The system sets the ta...

Page 48: ... 1 Limiting defrost control time 2 Forced cooling 3 Indoor frequency command Air conditioner control mode Forced operation mode Forced cooling operation for pump down operation Power transistor test mode Normal operation mode Fan Cooling includes drying Heating Heating Defrosting Stop indoor unit OFF Preheating operation Discharging from capacitor Stop R19522 Command frequency Limit frequency Skip...

Page 49: ...indoor heat exchanger volume and airflow rate set by remote controller PI Control 1 P control The D value is calculated in each sampling time 15 20 seconds and the frequency is adjusted according to its difference from the frequency previously calculated 2 I control If the operating frequency does not change for more than a certain fixed time the frequency is adjusted according to the D value When...

Page 50: ...e four way valve coil switches from ON to OFF when the heating is stopped the OFF delay switch of the four way valve is carried out Detail OFF delay switch of four way valve The four way valve coil is energized for 150 160 seconds after the operation is stopped 3 3 3 Four Way Valve Operation Compensation Outline At the beginning of operation as the four way valve is switched the pressure differenc...

Page 51: ...bove a certain level the upper limit of frequency is set to keep the discharge pipe temperature from rising further Detail 20 25 35 class 50 class A Hz 48 55 B Hz 64 70 C Hz 88 85 D seconds 240 120 E seconds 360 200 F seconds 180 470 sec Time R13528 Hz Frequency C B D E F A Zone Control Stop zone When the temperature reaches the stop zone the compressor stops Dropping zone The upper limit of frequ...

Page 52: ...ped Dropping zone The upper limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is lowered by 2 Hz every second until it reaches the keep zone Keep zone The present maximum frequency goes on Reset zone Limit of the frequency is canceled Limitation of current dropping and stop value according to the outdoor temperature The current drops when outd...

Page 53: ...igh pressure The operating frequency limitation is judged with the indoor heat exchanger temperature A C B C C C 9 5 7 5 5 5 R14718 Reset zone Indoor heat exchanger thermistor temperature Up zone Keep zone Dropping zone Stop zone 0 C C C B C A C 13 C Zone Control Stop zone When the temperature reaches the stop zone the compressor stops Dropping zone The upper limit of frequency decreases Keep zone...

Page 54: ...operation 5 Fan speed control during forced cooling operation The outdoor fan is controlled as well as normal operation during forced cooling operation 6 Fan speed control during POWERFUL operation The rotation speed of the outdoor fan is increased during POWERFUL operation 7 Fan speed control during indoor outdoor unit quiet operation The rotation speed of the outdoor fan is reduced by the comman...

Page 55: ...mpressor operates for 6 minutes More than A minutes of accumulated time have passed since the start of the operation or ending the previous defrosting Conditions for Canceling Defrost The judgment is made with the outdoor heat exchanger temperature B C 20 25 35 class 50 class A minutes 28 44 B C 4 18 4 12 C Hz 76 55 D Hz 86 90 E seconds 50 60 F seconds 60 120 G seconds 480 340 H seconds 60 50 J pu...

Page 56: ...discharge pipe thermistor is disconnected Feedback Control Target discharge pipe temperature control Detail The followings are the examples of electronic expansion valve control which function in each operation mode Available Not available Control Status Starting operation control Control when the frequency changes Target discharge pipe temperature control Discharge pipe thermistor disconnection c...

Page 57: ...g Operation Control The electronic expansion valve opening is controlled when the operation starts thus preventing superheating or liquid compression 3 11 5 Control when the Frequency Changes When the target discharge pipe temperature control is active if the target frequency changes to a specified value in a certain time period the target discharge pipe temperature control is canceled and the tar...

Page 58: ...rge pipe temperature 6 C outdoor heat exchanger temperature 2 When the operation mode is heating When the following condition is fulfilled the discharge pipe thermistor disconnection is ascertained Discharge pipe temperature 6 C indoor heat exchanger temperature When the thermistor is disconnected When the disconnection is ascertained the compressor continues operation for 9 minutes and then stops...

Page 59: ...consumption is below the specified value and the frequency is higher than the specified frequency it is regarded as refrigerant shortage The power consumption is low comparing with that in the normal operation when refrigerant is insufficient and refrigerant shortage is detected by checking power consumption II Detecting by discharge pipe temperature If the discharge pipe temperature is higher tha...

Page 60: ...SiBE041401E 49 Remote Controller Part 5 Remote Controller 1 Remote controller 50 ...

Page 61: ...ton once to start operation Press once again to stop it Temperature adjustment buttons AUTO DRY COOL HEAT FAN 18 30 C Not available 18 32 C 10 30 C Not available Displays the current settings In this illustration each section is shown with all its displays on for the purpose of explanation To use the remote controller aim the transmitter at the indoor unit If there is anything to block signals bet...

Page 62: ...u press the Swing button again Press this button and adjust the day and time with the Select button Press this button again to complete TIMER setting R19929 Weekly button Program button Copy button Back button Next button Lamp brightness setting button OUTDOOR UNIT QUIET operation is not available in FAN and DRY operation OUTDOOR UNIT QUIET operation and POWERFUL operation cannot be used at the sa...

Page 63: ...or Lock 75 4 14 DC Fan Lock 76 4 15 Input Overcurrent Detection 77 4 16 Four Way Valve Abnormality 78 4 17 Discharge Pipe Temperature Control 80 4 18 High Pressure Control in Cooling 81 4 19 Compressor System Sensor Abnormality 82 4 20 Position Sensor Abnormality 83 4 21 DC Voltage Current Sensor Abnormality 20 25 35 Class Only 85 4 22 Thermistor or Related Abnormality Outdoor Unit 86 4 23 Electri...

Page 64: ...amp OFF Check the outdoor temperature Heating operation cannot be used when the outdoor temperature is 24 C or higher and cooling operation cannot be used when the outdoor temperature is below 10 C Diagnose with remote controller indication 58 The unit operates but does not cool or does not heat Check for wiring and piping errors in the connection between the indoor unit and outdoor unit Check for...

Page 65: ...n the thermistor malfunctions 2 When a signal transmission error occurs between the indoor and outdoor units In either case conduct the diagnostic procedure described in the following pages Service Monitor The indoor unit has one green LED LED A on the control PCB When the microcomputer works in order the LED A blinks 2 2 Outdoor Unit The outdoor unit has one green LED LED A on the PCB When the mi...

Page 66: ...corresponding codes 2 To return to the normal mode hold the timer cancel button down for 5 seconds When the remote controller is left untouched for 60 seconds it also returns to the normal mode 3 Not all the error codes are displayed When you cannot find the error code try method 2 Refer to page 56 No Code No Code No Code 1 00 13 C7 25 UA 2 U4 14 A3 26 UH 3 L5 15 H8 27 P4 4 E6 16 H9 28 L3 5 H6 17 ...

Page 67: ...e same time 5C is displayed on the LCD 2 Select 5C service check with the Temp or Temp button 3 Press the Mode button to enter the service check mode The left side number blinks 4 Press the Temp or Temp button and change the number until you hear the two consecutive beeps or the long beep R11669 R11821 R11672 R11670 R11671 ...

Page 68: ...p or Temp button and change the number until you hear the long beep 8 Diagnose by the sound beep The left side number does not correspond with the error code two consecutive beeps The left side number corresponds with the error code but the right side number does not long beep Both the left side and right side numbers correspond with the error code 9 Determine the error code The numbers indicated ...

Page 69: ...el open close fault 64 C9 Room temperature thermistor or related abnormality 63 Outdoor Unit E1 Outdoor unit PCB abnormality 72 E5 OL activation compressor overload 73 E6 Compressor lock 75 E7 DC fan lock 76 E8 Input overcurrent detection 77 EA Four way valve abnormality 78 F3 Discharge pipe temperature control 80 F6 High pressure control in cooling 81 H0 Compressor system sensor abnormality 82 H6...

Page 70: ...eck the connection of connectors See Note Correct the connection OK Check the power supply voltage Start operation Voltage as rated Error repeats Check the power supply voltage Start operation Voltage as rated Error repeats Error repeats YES NO NO YES NO NO YES R15310 Caution To secure the connection once disconnect the connector and then reconnect it YES NO YES NO YES NO YES Match the compatible ...

Page 71: ...Heating peak cut control During heating operation the indoor heat exchanger temperature is above 65 C Supposed Causes Short circuited air Clogged air filter of the indoor unit Dust accumulation on the indoor heat exchanger Defective indoor heat exchanger thermistor Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 93 NO NO NO Check No 01 Check the indoor heat exchanger thermistor YE...

Page 72: ...l fan motor operation Error Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap and is less than 50 of the maximum fan motor rotation speed Supposed Causes Remarkable decrease in power supply voltage Layer short inside the fan motor winding Breaking of wire inside the fan motor Breaking of the fan motor lead wires Defective capacitor of the ...

Page 73: ...urn off the power before reconnecting the connector Replace the indoor fan motor Replace the indoor unit PCB Replace the indoor unit PCB Does the fan rotate smoothly Does the fan rotate Motor power supply voltage 310 340 VDC Turn off the power and rotate the fan by hand Turn on the power and start operation Check No 02 Check the output of the fan motor connector R19750 YES NO YES NO YES NO Replace...

Page 74: ...ed Causes Disconnection of connector Thermistor corresponding to the error code is defective Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 93 C4 Indoor heat exchanger thermistor C9 Room temperature thermistor YES R15717 NO Check No 01 Check the thermistor resistance value YES NO Caution Correct the connection Replace the thermistor Replace the indoor unit PCB Normal Normal Check...

Page 75: ...til the initialization finishes 4 Operate the unit by the indoor unit ON OFF button YES YES YES YES NO NO NO NO Replace the harness and reduction motor Replace the assembly of the front panel mechanism Check the movement of the right and left separately by hand Replace the assembly of the front panel mechanism It is supposed such as deformation of the panel or stuffed dust Find out the cause Repla...

Page 76: ...ontinue for 80 seconds Opening of the electronic expansion valve D Discharge pipe temperature E target discharge pipe temperature F Refrigerant shortage detection III 20 25 35 class only When the difference of the temperature is smaller than G C it is regarded as refrigerant shortage If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any other ...

Page 77: ...he pipe flare or replace the union Check the power transistor harness for loosening Correct it as required Also replace the cracked pipe Check the pipes for improper contact and correct them as required Replace the cracked pipe Replace the electronic expansion valve Replace the defective thermistor s Completed Refrigerant shortage error again Oil oozing at internal piping Stop valve closed Compres...

Page 78: ...tage detection The voltage detected by the DC voltage detection circuit is below 150 180 V depending on the model The compressor stops if the error occurs and restarts automatically after 3 minute standby Over voltage detection An over voltage signal is fed from the over voltage detection circuit to the microcomputer The compressor stops if the error occurs and restarts automatically after 3 minut...

Page 79: ...power supply voltage Check the connection of the compressor harness Disturbance factors Noise Power supply distortion Precaution before turning on the power again Make sure the power has been off for at least 30 seconds Replace the indoor unit PCB Turn on the power System restarted Repeat a few times Error again within 3 minutes after turning on the power Loose or disconnected NO YES NO Replace th...

Page 80: ...ecked whether it is normal Error Decision Conditions The data sent from the outdoor unit cannot be received normally or the content of the data is abnormal Supposed Causes Reduction of power supply voltage Wiring error Breaking of the connecting wires between the indoor and outdoor units wire No 3 Defective outdoor unit PCB Short circuit inside the fan motor winding Defective indoor unit PCB Distu...

Page 81: ... A blinking Properly insulated Is there any disturbance Is there any wiring error Check the indoor unit outdoor unit connection wires Check the LED A on the outdoor unit PCB Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Before you check the LED A cancel the standby electricity saving function by starting fan operation with the remote con...

Page 82: ...ecting wires Wrong indoor unit PCB or outdoor unit PCB mounted Defective indoor unit PCB Defective outdoor unit PCB Troubleshooting R19506 Caution NO YES YES YES NO NO Check the code numbers 2P012345 for example of the indoor and outdoor unit PCB with the Parts List Match the compatible models Change for the correct PCB Replace the indoor unit PCB or the outdoor unit PCB OK Matched compatibly Corr...

Page 83: ...se Momentary drop of voltage Momentary power failure Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO YES YES R19932 NO YES NO Replace the outdoor unit PCB 2 Ground the system Zero cross signal abnormality Replace the outdoor unit PCB 1 Replace the harness Check if the outdoor unit is grounded Is LED A blinking Gr...

Page 84: ...own Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of discharge pipe thermistor Defective discharge pipe thermistor Disconnection of connector S40 Disconnection of 2 terminals of OL Q1L Defective OL Q1L Broken OL harness Defective electronic expansion valve or coil Defective four way valve or coil Defective outdoor unit PCB Refrigerant sho...

Page 85: ...place the discharge pipe thermistor Replace the electronic expansion valve or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB Replace the four way valve or the coil Replace the outdoor unit PCB Discharge pipe thermistor disconnected Check No 01 Check the thermistors Check No 13 Check the four way valve Check No 14 Check the refrigerant line Check No 12 Check the...

Page 86: ...ther error Supposed Causes Compressor locked Compressor harness disconnected Troubleshooting Check No 15 Refer to P 96 Turn off the power Disconnect the harnesses U V and W R20103 Caution NO YES YES NO NO YES Check No 15 Check with the inverter analyzer Turn off the power and reconnect the harnesses Turn on the power again and restart the system Precaution before turning on the power again Make su...

Page 87: ...s Disconnection of the fan motor Foreign matter stuck in the fan Defective fan motor Defective outdoor unit PCB Troubleshooting Check No 16 Refer to P 97 R15675 Caution YES YES NO YES NO NO YES NO Turn on the power Rotate the fan Check No 16 Check the rotation pulse input on the outdoor unit PCB Turn off the power and reconnect the connector Remove the foreign matters Replace the outdoor fan motor...

Page 88: ...k No 18 Refer to P 99 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged An input overcurrent may result from wrong internal wiring If the system is interrupted by an input overcurrent after the wires have been disconnected and reconnected for part replacement check the wiring again R18318 NO YES YES NO Start operation and measure the...

Page 89: ... over 1 10 minutes depending on the model after operating for 5 10 minutes depending on the model Cooling Dry A B 5 C Heating B A 5 C A Room thermistor temperature B Indoor heat exchanger temperature If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of four way valve coil Defective four way valve c...

Page 90: ...logged Reconnect the thermistor s Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged R19543 Refrigerant shortage Water mixed Stop valve Four way valve coil disconnected loose Harness disconnected Any thermistor disconnected Check No 01 Check the thermistors Check No 14 Check the refrigerant line Check No 13 Check the four way valve sw...

Page 91: ...gerant shortage Defective four way valve Water mixed in refrigerant Defective stop valve Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 93 Check No 12 Refer to P 94 Check No 14 Refer to P 95 A C B C 1 above 45 Hz rising above 40 Hz dropping 110 97 2 30 45 Hz rising 25 40 Hz dropping 105 92 3 below 30 Hz rising below 25 Hz dropping 99 86 A C B C 110 95 R15825 Caution NG OK OK OK ...

Page 92: ...hermistor Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 93 Check No 12 Refer to P 94 Check No 17 Refer to P 98 Check No 18 Refer to P 99 Check No 19 Refer to P 99 R15667 Caution Replace the outdoor fan motor Reconnect the connector or fan motor lead wires Replace the stop valve Replace the outdoor heat exchanger thermistor Replace the outdoor unit PCB Replace the electronic exp...

Page 93: ...voltage value The DC voltage before compressor start up is below 50 V Supposed Causes Broken or disconnected harness Defective outdoor unit PCB Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO R11712 YES Turn off the power and turn it on again YES NO Replace the harness Replace the outdoor unit PCB Is the harness ...

Page 94: ... the position detection circuit Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes 20 25 35 class or 5 minutes 50 class without any other error Supposed Causes Disconnection of the compressor relay cable Defective compressor Defective outdoor unit PCB Start up failure caused by the closed stop valve Input voltage is outside th...

Page 95: ... No 20 Check the short circuit of the diode bridge Check No 15 Check with the inverter analyzer Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolytic capacitor voltage Electrical components or compressor harnesses connected as specified Replace the outdoor unit PCB Replace the compressor Correct the power supply or replace the outdoor unit PCB Reconnect the...

Page 96: ...ased on the compressor running frequency and the input current Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Defective outdoor unit PCB Troubleshooting Replace the outdoor unit PCB Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts ma...

Page 97: ...r on J3 error is judged if the discharge pipe temperature is lower than the heat exchanger temperature Supposed Causes Disconnection of the connector for the thermistor Thermistor corresponding to the error code is defective Defective heat exchanger thermistor in the case of J3 error outdoor heat exchanger thermistor in cooling operation or indoor heat exchanger thermistor in heating operation Def...

Page 98: ...rmistor s of the following thermistors Outdoor temperature thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Cooling Outdoor heat exchanger temperature Heating Indoor heat exchanger temperature Replace the indoor heat exchanger thermistor Replace the outdoor unit PCB Error displayed again on remote controller Indoor heat exchanger thermistor functioning Check No 01 Check the t...

Page 99: ... of connector Defective outdoor unit PCB Troubleshooting Check No 17 Refer to P 98 Check No 19 Refer to P 99 A C B C C C 20 25 35 class 98 75 83 50 class 122 64 113 Caution WARNING To cool the electrical components the outdoor fan starts when the radiation fin temperature rises above C C and stops when it drops below B C R19556 YES NO YES NG NO OK NO YES Turn off the power and turn it on again Che...

Page 100: ...mpressor on is above A C The error is cleared when the radiation fin temperature drops below B C If the error repeats the system is shut down Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Defective outdoor fan motor Short circuit Defective radiation fin thermistor Disconnection of connector Defective outdoor unit PCB Silicon grease is not applied prope...

Page 101: ... or parts may be damaged R19529 NO NG OK NO YES Check the radiation fin temperature NO YES YES Above A C Check No 19 Check the outdoor fan Error displayed again Has the PCB been replaced Check if silicon grease is applied properly on the radiation fin If not apply the silicon grease Replace the outdoor unit PCB Replace the outdoor fan motor Correct the connectors and fan motor leads Replace the ou...

Page 102: ...nning A speed error occurs while the compressor is running An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes 20 25 35 class or 5 minutes 50 class without any other error Supposed Causes Poor installation condition Closed stop valve Defective power mo...

Page 103: ...e system See if the same error occurs Check the power supply voltage Monitor the power supply voltage discharge and suction pressures and other factors for a long term Possible causes Momentary drop of power supply voltage Compressor overload Short circuit Check the installation condition Check with the inverter analyzer Check the power module Keep on using Check the connectors and other component...

Page 104: ...n a PCB remove the PCB from the control PCB to measure the resistance When the connector of indoor heat exchanger thermistor is soldered on a PCB remove the thermistor and measure the resistance Thermistor temperature C Resistance kΩ 20 197 8 15 148 2 10 112 1 5 85 60 0 65 93 5 51 14 10 39 99 15 31 52 20 25 02 25 20 00 30 16 10 35 13 04 40 10 62 45 8 707 50 7 176 R25 C 20 kΩ B 3950 K kΩ 150 100 50...

Page 105: ...n Valve Check Check No 12 Conduct the followings to check the electronic expansion valve EV 1 Check if the EV connector is correctly connected to the PCB 2 Turn the power off and on again and check if the EV generates a latching sound 3 If the EV does not generate a latching sound in the above step 2 disconnect the connector and check the continuity using a multimeter 4 Check the continuity betwee...

Page 106: ...l Cooling Dry No continuity Heating Continuity Replace the outdoor unit PCB Replace the four way valve coil Replace the four way valve Four way valve coil resistance at 1000 2000 Ω S80 voltage at 220 240 VAC with compressor on Fig 1 R11904 Fig 1 Voltage at S80 220 240 VAC Time Compressor ON Refrigerant system check Check for refrigerant leakage See the service diagnosis on refrigerant shortage U0 ...

Page 107: ...he charged voltage of the built in smoothing electrolytic capacitor drops to 10 VDC or below before carrying out the service work Reference If the terminals of the compressor are not FASTON terminals difficult to remove the wire on the terminals it is possible to connect wires available on site to the outdoor unit from output side of PCB Do not connect them to the compressor at the same time other...

Page 108: ...ut frequency is low the LEDs blink slowly As the output frequency increases the LEDs blink quicker The LEDs look like they are lit 2 On completion of the inverter analyzer diagnosis be sure to re crimp the FASTON terminals Otherwise the terminals may be burned due to loosening 5 8 Rotation Pulse Check on the Outdoor Unit PCB Check No 16 20 25 35 class 1 Check that the control voltage between the p...

Page 109: ...nit PCB If NG in step 4 Defective Hall IC Replace the outdoor fan motor If OK in both steps 2 and 4 Replace the outdoor unit PCB 5 9 Installation Condition Check Check No 17 1 2 3 4 5 6 7 320 VDC R19655 S70 PCB Actual rotation pulse input 0 15 VDC Rotation command voltage 0 6 5 VDC Control voltage 15 VDC Installation condition check OK Check the allowable dimensions of the air suction and discharg...

Page 110: ... connection pipe deformed Is the stop valve open High Replace the compressor Open the stop valve Replace the pipe installed at the site Clean the dirty air filter or indoor outdoor heat exchanger Replace the compressor Discharge pressure check R19395 YES NO NO YES Outdoor fan system is functioning Check the outdoor fan system Reconnect the connector Outdoor fan running Fan motor lead wire connecto...

Page 111: ...eferring to the table below If the resistance is or less than 1 kW short circuit occurs on the main circuit 20 25 35 class 50 class Negative terminal of multimeter positive terminal for digital multimeter 2 3 4 2 3 1 Positive terminal of multimeter negative terminal for digital multimeter 4 2 3 1 2 3 Resistance is OK several kΩ several MΩ several kΩ several MΩ Resistance is NG 0 Ω or 0 0 0 Ω or R1...

Page 112: ... resistance between the or terminal of the diode bridge or the power module and the U V or W terminal of the compressor with a multimeter Evaluate the measurement results referring to the following table 20 25 35 class Negative terminal of multimeter positive terminal for digital multimeter Diode bridge or Power module UVW Diode bridge or Power module UVW Positive terminal of multimeter negative t...

Page 113: ...SiBE041401E Check Service Diagnosis 102 50 class Diode bridge R19944 ...

Page 114: ...r Servicing 104 1 1 Pump Down Operation 104 1 2 Forced Cooling Operation 104 2 Trial Operation 106 3 Field Settings 107 3 1 When 2 Units are installed in 1 Room 107 3 2 Model Type Setting 107 3 3 Standby Electricity Saving 108 3 4 Jumper Settings 109 4 Silicon Grease on Power Transistor Diode Bridge 110 ...

Page 115: ...itions are met 1 The outdoor unit is not abnormal and not in the 3 minute standby mode 2 The outdoor unit is not operating Start The forced cooling operation starts when any of the following conditions are fulfilled 1 Press the forced cooling operation ON OFF button S1W on the indoor unit for 5 seconds 2 Press the forced cooling operation ON OFF button SW1 on the outdoor unit within around 3 minut...

Page 116: ...Unit 50 class Caution When pressing the button on the outdoor unit do not touch the terminal board It has a high voltage and may cause electric shock R19927 Indoor unit ON OFF button 1 2 3 Push here Screwdriver R18256 Terminal board 1 2 3 Screwdriver R20102 Forced cooling operation ON OFF button SW1 Push Terminal board ...

Page 117: ...ature 30 C Trial operation may be disabled in either operation mode depending on the room temperature After trial operation is complete set the temperature to a normal level 26 C 28 C in cooling 20 C 24 C in heating operation For protection the system does not start for 3 minutes after it is turned off ARC466 Series 1 Press the On Off button to turn on the system 2 Press the center of the Temp but...

Page 118: ...r Jumpers are necessary for electronic circuit Improper operation may occur if you cut any of them Wireless Remote Controller Cut the address setting jumper Replace the remote controller if you cut the jumper on the left side The heating operation will not be available when the jumper on the left side is cut 3 2 Model Type Setting This remote controller is common to the heat pump model and cooling...

Page 119: ...ed for turning ON the function 1 Check that the main power supply is turned OFF Turn OFF if it has not been turned OFF 2 Remove the stop valve cover 3 Disconnect the selective connector for standby electricity saving 4 Turn ON the main power supply 20 25 35 class 50 class Caution Before connecting or disconnecting the selective connector for standby electricity saving make sure that the main power...

Page 120: ...on Jumper When connected factory setting When cut Fan speed setting when compressor stops for thermostat OFF effective only in cooling operation JB The fan stops Fan speed setting Remote controller setting Power failure recovery function JC Auto restart The unit does not resume operation after recovering from a power failure Timer settings are cleared Function Jumper When connected factory setting...

Page 121: ... bridge Detail 1 Wipe off the old silicon grease completely 2 Apply the silicon grease evenly See the illustrations below for examples of application 3 Tighten the screws of the power transistor diode bridge 4 Make sure that the heat radiation parts are firmly contacted to the radiation fin Note Smoke emission may be caused by bad heat radiation when the silicon grease is not appropriately applied...

Page 122: ...SiBE041401E 111 Appendix Part 8 Appendix 1 Piping Diagrams 112 1 1 Indoor Unit 112 1 2 Outdoor Unit 112 2 Wiring Diagrams 114 2 1 Indoor Unit 114 2 2 Outdoor Unit 114 ...

Page 123: ...OSS FLOW FAN FAN MOTOR REFRIGERANT FLOW HEATING 4D085834 HEAT EXCHANGER OUTDOOR UNIT HEAT EXCHANGER 7 0 CuT 7 0 CuT 9 5 CuT EV 4 8 CuT 6 4 CuT 6 4 CuT 4 8 CuT M φ 4 0 x ID 2 0 CuT PROPELLER FAN 9 5 CuT 9 5 CuT 6 4 CuT 7 9 CuT 9 5 CuT MUFFLER 9 5 CuT 9 5 CuT COMPRESSOR MUFFLER MUFFLER 7 9 CuT ACCUMULATOR REFRIGERANT FLOW COOLING HEATING OUTDOOR TEMPERATURE THERMISTOR HEAT EXCHANGER THERMISTOR MUFFL...

Page 124: ...ING HEATING 6 4 CuT 4 0 CuT CAPILLARY TUBE 4 6 4 CuT M PROPELLER FAN EV FILTER 12 7 CuT 6 4 CuT 9 5 CuT 12 7 CuT RECEIVER 7 9 CuT 12 7 CuT MUFFLER MUFFLER 6 4 CuT 7 9 CuT 9 5 CuT MUFFLER 7 9 CuT 12 7 CuT COMPRESSOR HEAT EXCHANGER THERMISTOR DISCHARGE PIPE THERMISTOR FOUR WAY VALVE ON HEATING OUTDOOR TEMPERATURE THERMISTOR MUFFLER WITH FILTER ELECTRONIC EXPANSION VALVE LIQUID STOP VALVE GAS STOP VA...

Page 125: ...BLK 9 9 BLK MR30_B MR30_A E2 MRCW GRN BLU RED YLW S70 S100 S50 S90 S20 S40 PCB1 X11A S80 1 3 3 1 1 2 13 12 1 11 4 7 10 1 6 1 1 6 2 GRN OUTDOOR BLK WHT WHT BLU BRN BRN RED NOTE YLW GRY BLK BLK BLU RED BLU BLU BLK BLK BLK BLK BLK BLK ORG BRN RED BLU BLK ORG WHT YLW WHT YLW 4 1 2 1 t t t 3 1 Y1R S80 X12A M S110 V Q1L U R1T R2T R3T W SW1 BLK BLK Y1E OUTDOOR DISCHARGE M1F M1C PCB3 CONDENSER 1 REFER TO ...

Page 126: ...R THERMISTOR SURGE ABSORBER OUTDOOR DISCHARGE CONDENSER VARISTOR TERMINAL STRIP ELECTRONIC EXPANSION VALVE COIL REVERSING SOLENOID VALVE COIL FERRITE CORE PROTECTIVE EARTH EARTH C7 C8 DB1 DB3 FU1 FU2 FU3 FU4 IPM L L803 L804 M1C M1F MRCW MRM10 MRM20 MR30 MR30_A MR30_B N Q1L CAPACITOR DIODE BRIDGE FUSE FIELD FUSE INTELLIGENT POWER MODULE LIVE REACTOR COMPRESSOR MOTOR FAN MOTOR MAGNETIC RELAY NEUTRAL...

Page 127: ...Revision History Month Year Version Revised contents 03 2014 SiBE041401E First edition ...

Page 128: ...supplied or specified by Daikin Ask a qualified installer or contractor to install those parts and accessories Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage electrical shock fire or explosion z Read the User s Manual carefully before using this product The User s Manual provides important safety instructions a...

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