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Hitachi RCI-3.0UFE1NH, Service Manual

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Hitachi RCI-3.0UFE1NH Service Manual Download Page 27

2

.TROUBLESHOOTING

Fault 

code 

Fault  description 

Possible  

r

eason

s

  f 

or

 

a

bnormality 

How to 

d

eal 

w

ith 

Remarks 

74  Indoor EEPROM 

Data 2 

fault

 

EE  in  MCU  is  fai

ls

,  the  unit 

can run, but the function user 

has set is ineffective. 

Replace EE data in MCU. 

81 

Indoor ambient 

Temperature 

Sensor Fault 

1.

The cable of the room

temperature sensor

 is

 connect

ed

loose

ly

;

2.

The room temperature sensor

fail

s

;

3.

The sampling circuit is abnormal

.

1. Reconnect the cable of the

room temperature sensor;

2. Replace the room temperature

sensor;

3. Replace the indoor control

board.

83 

Evaporator Middle 

Temperature 

Sensor Fault 

1.

The cable of the coil temperature

sensor of the evaporator fail

s

;

2.

The coil temperature sensor of

the evaporator

 

fail

s

;

3.

The sampling circuit is abnormal

.

1. Reconnect the cable of the

coil temperature sensor of the

evaporator;

2. Replace the coil

temperature sensor of the

evaporator;

3. Replace the indoor

control board.

FE 

(254) 

Communication 

between main 

control board &

 

Wir

ed

 controller 

Fault (display on 

wir

ed

 controller) 

1. The

 

wir

ed

 controller 

and

 the

 

indoor

 

control board 

are

 

connect

ed

 loose

ly

;

2.

The sequence of the wiring

between the wir

ed

 controller

to the indoor control board

 

is

wrong;

3.

The wiring between the

wir

ed

 controller to the indoor

control board fail

s

;

4.

The wir

ed

 controller

 

fai

ls

;

5.

The indoor control board

is abnormal.

1.

2.

 Reconnect the wiring between

 

the wir

ed

 controller to the

 

indoor control board;

 

Replace the wiring between

the wir

ed

 controller to the

 

indoor control board;

3.

 Replace the wiring between

the wir

ed 

controller to the

indoor control board;

4.

 Replace the wir

ed

 controller;

5.

 Replace the indoor control

b

oard.

ER 

Communication 

between main 

control board 

&

 

display board 

Fault (displays on 

display board) 

1.

The wiring between the display

board to the indoor control

board 

is 

connect

ed

 loose

ly

;

2.

The sequence of the wiring

between the display board to the

indoor control board is wrong;

3.

The wiring between the display

board to the indoor control

board

 

fail

s

;

4.

The display board

 

fail

s

;

5.

The indoor control board fail

s

.

1.

Reconnect the 

wiring

between

 

the display board

to the

 

indoor control board;

2.

Replace the wiring between

the display board to the

indoor control board;

3.

Replace the wiring between

the display board to the

indoor control board;

4.

Replace the display board;

5.

Replace the indoor

 

control

board.

25

Summary of Contents for RCI-3.0UFE1NH

Page 1: ... 0UFE1NH RPIH 5 0UFE1NH RPIH 6 0UFE1NH RPIH 6 5UFE1NH CASSETTE RCI 3 0UFE1NH RCI 3 5UFE1NH RCI 4 0UFE1NH RCI 5 0UFE1NH RCI 6 0UFE1NH RCI 6 5UFE1NH FLOOR CEILING RPFC 3 0UFE1NH RPFC 3 5UFE1NH RPFC 4 0UFE1NH RPFC 5 0UFE1NH RPFC 6 0UFE1NH RPFC 6 5UFE1NH RAS 3 0UFESNH1 RAS 3 5UFESNH1 RAS 4 0UFESNH1 RAS 5 0UFESMH1 RAS 6 0UFESMH1 RAS 6 5UFESMH1 RAS 5 0UFESNH1 RAS 6 0UFESNH1 ...

Page 2: ... 16 2 2 Fault codes 21 3 Checking components 30 3 1 Check refrigerant system 30 3 2 Check parts unit 32 4 Disassembly and assembly for compressor and motor 36 5 Control logic description 46 5 1 Fan only mode 46 5 2 Cooling mode 46 5 3 Heating mode 47 5 4 Auto mode 48 5 5 Evaporator low temperature protection 48 5 6 Condenser high temperature protection 49 ...

Page 3: ...al and installation 1 Selecting the Installation Location Please select the installation location according to safety precautions 2 Removing the upper cover of the wired controller Insert the slotted screwdriver in the slots and press on it for removal 4 3 Removing the insulating strip of the battery Otherwise the wired controller cannot work normally after installation Wiring Leading out wire Pul...

Page 4: ...meter set 6 Temperature display setting 0 Display the set temperature 1 Display the indoor environment temperature The factory setting defaults to 0 7 Temperature measurement unit display setting 0 Display in Celsius 1 Display in Fahrenheit degree 8 Cooling only setting 0 Heat pump type air conditioner 1 Cooling only air conditioner 10 Temperature limits revision setting 0 Not permitted 1 Permitte...

Page 5: ...ure detected is different from the actual room temperature so setting correction is necessary Room temperature correction value 1 2 3 4 Setting method Press and hold the and button at the same time for 5s to enter parameter setting mode Press or until room temperature icon and temp value start blinking on the screen and press to enter room temp correction mode Press the or button to adjust the roo...

Page 6: ...ON OFF BUTTON The appliance will be started or stopped when this button is pressed MODE BUTTON Press this button to select the operation mode FAN BUTTON Used to select fan speed in sequence high auto low medium high TIMER CLOCK BUTTON Used to set the current time or set Timer ON OFF UP SETTING BUTTON Used to raise the setting values or to set the airflow direction DOWN SETTING BUTTON Used to lower...

Page 7: ...g Fahrenheit Temperature 1 Heating and electric heating function are not available for single cooling only models 2 Air direction Filter Cleaning Floor Heat Electric Heating etc are only available for specific models For details please refer to the operation manual 3 Custom setting parameters must be configured by installer or authorized person Basic operation This wired controller should be used ...

Page 8: ...hange in the following sequence None No display UP DOWNANDLEFT RIGHT AirflowSwing MEDIUM HIGH AUTO Up Down Airflow Swing Left Right Airflow Swing blinking LOW The maximum cooling heating capacity can be activated at the super mode How to activate Press and hold and buttons for 5s simultaneously with the working unit to activate the super mode and the indoor unit will run at the ultrahigh fan speed...

Page 9: ...and buttons simultaneously for 5s again to unlock and icon will disappear from the LCD FILTER CLEAN screen prompt is only available for some models For details please refer to indoor unit manuals Be sure to stop the operation and turn off the power supply before performing any cleaning When is displayed on LCD it indicates that the filter needs to be cleaned Please contact professional staff to pe...

Page 10: ...me procedure It can be set from 00 to 59 with 1 minute resolution Press button to confirm Single TIMER ON setting The display will return to previous screen and icon will appear on the upper right corner of the screen How to cancel To cancel TIMER ON press button to activate the Timer ON setting press button to adjust time hour until icon OFF appears press button to confirm cancellation and exit Y...

Page 11: ... 1 until icon WEEKLY is displayed on LCD TIMER OFF weekday and clock set are flickering button to enter day of week selection Press Press button to select weekday display from sunday to saturday button to enter TIMER OFF hour s button to select desired timer of hours Press Press Press Press it can be select from 00 23 or OFF if need to cancel TIMER OFF function Press Press Press Press button to en...

Page 12: ...ng pages Heating and electric heating function are not available in single cooling only models Pictures in the manual are for reference only specifications are subject to change based on the selected model Indication symbols on LCD Dry indicator Fan only indicator Heating indicator Auto indicator Cooling indicator High fan speed Medium fan speed Low fan speed Quiet fan speed Signal transmit Batter...

Page 13: ...eries with the new ones Please do not use manganese battery because it may cause malfunction Avoid extremely hot or cold locations such as placing it near or over a radiator or in direct sunlight Also avoid placing under fluorescent light Do not let children play with the remote controller To avoid interference the indoor unit and the remote controller unit should be at least 1m away from a TV set...

Page 14: ...cooling only models Press Press Press button can change the unit operation status Result Press Press Auto High Medium button Raise temperature by 1 button Lower temperature by 1 Press Result Result Low Quiet Low PRESS Press MODE button and cancel AUTO mode Note Temperature airflow and direction are controlled automatically in AUTO mode AUTO mode How to set AUTO mode Press the AUTO button Result En...

Page 15: ...t high fan speed the set temperature automatically goes to 16 Press POWERFUL button at the heat mode Result At high fan speed the set temperature automatically goes to 30 How to cancel POWERFUL mode Press POWERFUL MODE FAN ON OFF button Result The display return to the original mode Escape from POWERFUL mode PRESS PRESS Timer mode It is convenient to set the timer on with TIMER button when you go ...

Page 16: ...he indicator disappears the timer on mode has been cancelled How to cancel TIMER ON 2 3 PRESS PRESS PRESS SLEEP mode can be set in COOLING HEATING or DRYING mode This function gives you a more comfortable environment for sleep The appliance will stop operation automatically after operating for 8 hours Fan speed is automatically set at low speed SLEEP mode How to set SLEEP mode Each time SLEEP butt...

Page 17: ...is shown in the figure below Avoid installing it close to the fluorescent lamp The figures in this manual are based on the external view of a standard model Consequently the shape may differ for the air conditioner you have selected Operation 5 Max permission distance up to 8m Indoor Unit IR Receiver Wireless Remote Controller Virtual Line between Transmitter and Receiver Sending commands from con...

Page 18: ...oors The air tightness is not enough People come in and out too frequently 4 Block of outdoor heat exchanger 5 Improper setting of temperature 1 Clean the heat exchanger of the outdoor unit such as condenser 2 Remove heating devices 3 Keep certain air tightness indoors 4 Remove block obstacles 5 Check and try to set temperature again Sound from deforming parts During system starting or stopping a ...

Page 19: ... LED RUN defrost flash 3 times at the same time and LED DEFROST continue flashing 3 times reports No 36 fault Display panel 1 2 2 TROUBLESHOOTING 1 2 Run indicator Red Indicates the fault code represented by 2 digit number Defrost indicator Green Indicates the fault code represented by single digit number DEFROST FILTER TIME RUN EMERGENCY 2 1 2 1 LED FALSH CONTROL flash 300mS T1 off 300mS T2 after...

Page 20: ...rive control fault When LED3 is off LED1 and LED 2 indicate main control fault code When LED3 is on LED1 and LED 2 indicate drive control fault code When LED3 is flickering and LED1 LED 2 are all off indicate compressor is preheating Failures display with 5s interval It means LED will be off for 5s to report next fault code System protection codes display method is the same with main control fault...

Page 21: ...ING Digital Tube Outdoor Control Board Drive fault code display The lamp of drive board flashing shows failure occurs 4 0 5 0 6 0 6 5HP Main control fault display Fault code will be displayed on digital tube board 19 ...

Page 22: ...ED1 LED3 Power lamp Drive fault code display The lamp of drive board flashing shows failure occurs How many times the drive failure lamp flick will show the failure code Single phase models 3 phase models How many times the drive failure lamp flick will show the failure code 20 ...

Page 23: ...rd components 3 Reassemble the EE components 5 Cooling freezing protection the indoor coil temperature is too low or heating overload indoor coil temperature is too high 1 The indoor unit can not blow air normally 2 The room temperature is too low in cooling mode or the room temperature is too high in heating 3 The filter is dirty 4 The duct resistance is too high resulting in low air flow 5 The s...

Page 24: ...rant is not enough 4 The expansion valve fails in heating mode 5 The outdoor control board is abnormal 1 Reconnect the wiring of the low pressure switch 2 Replace the low pressure switch 3 Check the welding point to confirm whether the unit leaks and then add some refrigerant 4 Replace the expansion valve 5 Replace the outdoor control board Applied to models with low pressure switch or pressure se...

Page 25: ...n motor 3 Replace the upper DC fan motor 4 Replace the driver board of the fan motor 5 Check the outdoor fan and ensure the outdoor fan can run normally 49 The outdoor DC fan motor fault down fan motor 1 2 The connecting wiring of the down DC fan motor is loose The cord of the down DC fan motor fails 3 The down DC fan motor fails 4 The drive circuit of the down DC fan motor fails 5 The outdoor fan...

Page 26: ...outdoor control board to the terminal fails 4 The indoor control board fails 5 The outdoor control board fails 1 Reconnect the connection cable referring to the indoor and outdoor wiring diagram 2 Reconnect the communication cable referring to the indoor and outdoor wiring diagram 3 Replace the communication cable referring to the indoor and outdoor wiring diagram 4 Replace the indoor control boar...

Page 27: ...re connected loosely 2 The sequence of the wiring between the wired controller to the indoor control board is wrong 3 The wiring between the wired controller to the indoor control board fails 4 The wired controller fails 5 The indoor control board is abnormal 1 2 Reconnect the wiring between the wired controller to the indoor control board Replace the wiring between the wired controller to the ind...

Page 28: ...uch as condenser 5 The speed of the outdoor fan motor is too low Check the outdoor fan motor and fan capacitor 6 The outdoor fan is broken or the outdoor fan is blocked Check the outdoor fan 7 The air inlet and outlet has been blocked Remove the obstructions 8 The expansion valve or the capillary fails Replace the expansion valve or the capillary NOTE 4 Over load in heating mode Overload in heatin...

Page 29: ...W voltage detected failure 15 AD offset abnormal detected failure Driver board fails Change the driver board 16 Inverter PWM logic set fault 17 Inverter PWM initialization failure 18 PFC_PWM logic set fault 19 PFC_PWM initialization fault 20 Temperature is abnormal 21 Shunt resistance unbalance adjustment fault 22 Communication failure 1 Communication wire connection is not proper 2 Driver board f...

Page 30: ...ver board 8 DC voltage overload voltage 1 Supply voltage input is too high 2 Driver board fault 1 Check power supply 2 Change the driver board 9 AC voltage imbalance Driver board fails Change the driver board 10 The PFC current detection circuit fault before compressor is ON Bad driver board components Change the driver board 11 AC voltage supply in outrange 1 Power supply abnormal power frequency...

Page 31: ...18 Driver board read EE data error 1 EEPROM has no data or data error 2 EEPROM circuit fault 1 Change EEPROM component 2 Change the driver board 19 PFC chip receive data fault Abnormal communication loop Change the drive board 20 PFC soft start is abnormal Abnormal PFC drive loop Change the drive board 21 The compressor drive chip could not receive data from PFC chip Communication loop fault Chang...

Page 32: ...ence between tube s temperature Test Test pressure 3 Checking components 3 1 Check refrigerant system TEST SYSTEM FLOW Conditions Compressor is running The air condition should be installed in good ventilation Tool Pressure Gauge Technique see feel test 30 ...

Page 33: ...f the pressure is close to static pressure NO NO 4 way valve collude or compressor exhaust very ebb yes NO yes Heating mode Test system pressure Is the high pressure normal at service part The pressure on the high side The pressure on the low side Recharge refrigerant after air purging with the vacuum pump Is the high pressure normal over again Air remains at the refrigerant system yes The system ...

Page 34: ...he resistance of the main winding The indoor fan motor fails if the resistance of main winding is 0 short circuit or open circuit Test in voltage TOOL Multimeter Insert screwdriver to rotate indoor fan motor slowly for 1 revolution or over and measure voltage YELLOW and GND on motor The voltage repeat 0V DC and 5V DC NOTES Please don t hold motor by lead wires Please don t plug IN OUT the motor co...

Page 35: ...D8121 1 5 0HP SIC 81FW F1138 1 6 0 6 5HP SIC 71FW D8121 1 SIC 71FW D8121 2 3 Compressor COMPRESSOR EXAMINE AND REPAIR 3 0 3 5HP KTM240D57UMT 6 0HP KTF400D64UMT DC Inverter Controller Compressor Power 4 0 5 0HP KTF310D43UMT 6 5HP KTQ420D1UMU DC Inverter Controller Thermal Sensor Compressor Power 33 ...

Page 36: ...nce TOOL Multimeter Test the resistance of the winding The compressor fails if the resistance of winding is 0 short circuit or open circuit Familiar error 1 Compressor motor lock 2 Discharge pressure value approaches static pressure value 3 Compressor motor winding abnormality NOTES 1 Don t put a compressor on its side or turn over 2 Please assembly the compressor in your air conditioner rapidly a...

Page 37: ...eter Test the resistance of winding The stepper motor fails if the resistance of winding is 0 short circuit or open circuit 6 FUSE Checking continuity of fuse on PCB ASS Y Remove the PCB ASS Y from the electrical component box Then pull out the fuse from the PCB ASS Y Fig 1 Fuse PCB Ass Y Fig 1 Check for continuity by a multimeter as shown in Fig 2 Fuse Fig 2 35 ...

Page 38: ...ltage free Step Illustration Handling Instruction 1 Remove external casing 1 Remove the top cover handle and valve cover 2 Remove the outer case and right side plate 2 Remove motor 1 Remove the blade nut and then remove the blade 2 Remove the motor from motor supporter 3 Remove compressor 1 Reclaim the refrigerant from the entire system 2 Unsolder the 4 way valve piping assy from compressor 3 Remo...

Page 39: ...he top cover handle and valve cover 2 Remove the outer case and right side plate 2 Remove motor 1 Remove the blade nut and then remove the blade 2 Remove the motor from motor supporter 3 Remove compressor 1 Reclaim the refrigerant from the entire system 2 Unsolder the 4 way valve piping assy from compressor 3 Remove the compressor mounting bolts Carefully remove the compressor from chassis 4 Assem...

Page 40: ...emove the blade nut and then remove the blade 2 Remove the motor from motor supporter 3 Remove gas liquid separator 1 Reclaim the refrigerant from the entire system 2 Unsolder the 4 way valve piping assy from gas liquid separator 3 Remove the gas liquid separator 4 Remove compressor 1 Reclaim the refrigerant from the entire system 2 Unsolder the 4 way valve piping assy from compressor 3 Remove the...

Page 41: ... the screws on fan sub assembly 4 Removing the fan cage enclosure Rotate the fan cage housing toward supply opening and remove 5 Loosen the fan crosshead and motor Use a hex wrench to loosen the screws holding the fan cage to the motor shaft and the screws holding the crosshead to the motor shaft Remove outer housing holding motor in place 6 Replace the motor Remove the motor from the support brac...

Page 42: ...ews on fan sub assembly and fan cage enclosure Remove the screws on fan sub assembly Rotate the fan cage housing toward supply opening and remove it 4 Loosen the hook parts and put the motor with fan sub assembly on the ground Loosen the hook parts Then put the motor with fan sub assembly on the ground 5 Loosen the fan and motor then replace the motor Use a hex wrench to loosen the screws holding ...

Page 43: ...an and motor Use a offset spanner to loosen the screws holding the fan cage to the motor shaft Remove outer housing holding motor in place 3 Remove the diversion circle and support bracket Use screwdriver to remove the diversion circle and support bracket 4 Replace the motor Remove the fan cage from the motor shaft Remove the motor from the air inlet and replace with new motor Be sure to tighten t...

Page 44: ...te pan Use screwdriver to loosen the screws holding the drain pan in place 3 Loosen the bolts holding the fan blades in place and remove the fan blade Use a wrench or socket to carefully remove the fan blade bolts 4 Loosen the screws holding the motor in place and remove the motor and replace it Use screwdriver to loosen the screws holding the motor Cassette type Removal and Assembly of Fan Motor ...

Page 45: ...n and take out the 4 screws then open the down front panel assembly Loosen and take out the 4 screws fixing the hinge then remove the down front panel assembly 2 Disassembly of the mounting plate Loosen and take out the 2 screws fixing the mounting plate then remove it 3 Disassembly of the electric box Loosen and take out the 3 screws fixing the electric box then take it Floor ceiling type 43 ...

Page 46: ...een the up shell and the below shell Take out of the motor and centrifugal fan blade Remove the 2 screws fixing the centrifugal fan blade and get the motor 5 Disassembly of the motor 3 5 4 0HP Remove the fasteners between the up shell and the below shell on both sides of the motor Remove the 2 screws fixing the crosshead and take it away from the motor Take out of the motor and centrifugal fan bla...

Page 47: ...ion Handling instruction Yellow line The wire of motor Dotted yellow line The wire is under the fan shell Blue helix Wire strap During assembling the wire of motor should be in tension and tied by the wire strap securely Make sure the upper part of wire is parallel to the bottom as illustration The distance between the wire and the cover of the electrical box should be 20mm Make sure the electrica...

Page 48: ...Compressor and outdoor fan running rules Once the compressor starts up it will follow the below rules When indoor room temp T1 is lower than Ts the compressor and outdoor fan will shut off When T1 is higher than Ts 1 the compressor and outdoor fan will start up Outdoor fan running rules Once the outdoor fan starts up it will follow the below rules Single outdoor fan First it will run in an invaria...

Page 49: ...as high medium low and auto The auto fan T1 is indoor room temperature Ts is setting temperature DC Inverter outdoor unit Outdoor fan running rules Once the outdoor fan start up it will follow the below rules Single outdoor fan First it will run in an invariable speed for a short time Then it will regulate the speed by the indoor coil temperature Double outdoor fan If it has two outdoor fans the u...

Page 50: ...nt mode The louver operates the same as in relevant mode If the compressor keeps stopping for 10 minutes or the set temperature is modified the machine will choose mode according to ΔT again 5 5 Evaporator low temperature protection DC Inverter AC will enter T2 protection if any of the following condition is satisfied Condition Cooling mode When the indoor coil temp T2 keeps lower than TE5 for 120...

Page 51: ... and outdoor fan will restart up Condition2 Heating mode When the indoor coil temp T3 keeps higher than T2 for 10 seconds the compressor and outdoor fan will shut off When T3 is lower than T1 the compressor and outdoor fan will restart up T3 TE10 Off On TE11 5 6 Condenser high temperature protection DC Inverter outdoor unit AC will enter T3 protection if any of the following conditions is satisfie...

Page 52: ...se of material resources To return your used device please use the return and collection systems or contact the retailer where the product was purchased They can take this product for environmental safe recycling Specifications in this document are subject to change without notice in order that Hitachi Johnson Controls Air Conditioning Inc may bring the latest innovations to their customers 2019 J...

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