Hitachi RAW-35RHC Service Manual Download Page 81

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6 Troubleshooting
Indoor unit

SMGB0135 rev.0 - 06/2020

Alarm code

Tank over-temperature limit protection

• The alarm code is displayed on the LCD controller when the temperature of the water is higher than 86 °C.
• This alarm forces the heat pump and the heater to stop.
• The unit should be stopped to release the alarm.

Is the

heater

working?

Is the

heater

working?

Check and restart

the thermostat

reset switch

Disconnect

wires and check

heater continuity

Is there

continuity?

Faulty heater

(Change it)

Disconnect CN15

Relay-AR from

the PCB

Is the

heater still

working?

Check relay-AR

continuity

Is there

continuity to

the heater

thermostat?

Faulty PCB

(Change it)

Faulty realy-AR

(Change it)

Yes

Alarm code

Communication failure between Indoor unit and LCD controller (PC-ARFTE)

• The alarm code is displayed on the unit controller when there is no communication between indoor unit PCB and the

unit controller for 90 seconds.

• This alarm forces all operations to stop.
• The unit should be stopped to release the alarm.

Unit

Controller

PCB

CN2-1

CN20-1

CN2-2

CN20-2

CN2-3

CN20-3

CN2-4

CN20-4

Are the connections

between PCB and

LCD controller correctly

connected?

Yes

Check wiring: repair broken / wrong wiring

Faulty Unit controller or PCB

(Check it)

Contact your local dealer

Summary of Contents for RAW-35RHC

Page 1: ...YUTAMPO SERIES Indoor unit YUTAMPO TAW 190 270 RHC Outdoor unit RAW 35RHC Service Manual ...

Page 2: ......

Page 3: ...SMGB0135 rev 0 03 2020 I Contents 1 2 3 4 5 6 7 General information Preparation Control functions Electrical checks of main parts Servicing Troubleshooting Maintenance notes Contents ...

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Page 5: ...de list 6 2 Preparation 7 2 1 Name of each part 8 2 1 1 Tank unit TAW 190 270 RHC 8 2 1 2 Outdoor unit RAW 35RHC 8 2 2 Name and function of control panel 9 2 3 Preparing for operation 11 2 3 1 Filling up the tank 11 2 3 2 Turning on the power 11 2 4 Setting the language 12 2 5 Setting the current time 12 2 6 Setting hot water temperature 13 3 Control functions 15 3 1 System diagram 16 3 2 Basic op...

Page 6: ... 32 3 16 Inputs and outputs 32 3 16 1 Inputs 32 3 16 2 Outputs 32 3 17 Operation information 33 3 18 Controller Settings 33 3 19 About 34 4 Electrical checks of main parts 35 4 1 Outdoor unit 36 4 1 1 Power circuit 36 4 1 2 Power circuit low voltage 38 4 1 3 PCB for power circuit 39 4 1 4 Reversing valve control circuit 39 4 1 5 Temperature detection circuit 40 4 1 6 Electric expansion valve circu...

Page 7: ... of the safety thermostat 55 5 2 7 Replacing the Mg Anode rod 56 6 Troubleshooting 57 6 1 Outdoor unit 58 6 1 1 Discharge procedure and power shut off method for power circuit 58 6 1 2 Troubleshooting support 60 6 1 3 Self diagnosis lighting mode 61 6 1 4 Checking the electrical parts of the outdoor unit 64 6 1 5 Checking the refrigerant cycle 67 6 1 6 How to run the indoor unit with the outdoor u...

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Page 9: ...ation 2 1 1 1 General notes 2 1 1 2 Introduction 2 1 2 Applied symbols 3 1 3 Norms and Regulations 3 1 4 Product guide 4 1 4 1 Classification of the units 4 1 4 1 1 Outdoor unit 4 1 4 1 2 Indoor unit 4 1 4 2 Product guide 5 1 4 2 1 Outdoor unit 5 1 4 2 2 Indoor unit 5 1 4 3 Accessory code list 6 ...

Page 10: ...odification must be made to the equipment without prior written authorization from the manufacturer NOTE This air to water heat pump has been designed for standard water heating for human beings For use in other applications please contact your Hitachi dealer or service contractor 1 1 2 Introduction Hitachi proudly announces the newest R32 complete range of Heat Pump Water Heater in its award winn...

Page 11: ...tion EU No 517 2014 on Certain Fluorinated Greenhouse gases it is mandatory to fill in the label attached to the unit with the total amount of refrigerant charged on the installation Do not vent R32 into the atmosphere R32 is fluorinated greenhouse gases covered by the Kyoto protocol global warming potential GWP R32 675 Tn of CO2 equivalent of fluorinated greenhouse gases contained is calculated b...

Page 12: ...the units 1 4 1 1 Outdoor unit Unit type Outdoor unit Split air system Position separating hyphen fixed Compressor power R32 refrigerant Heat pump Series RAW 35 R H C 1 4 1 2 Indoor unit Unit type YUTAMPO Position separating hyphen fixed Tank capacity 190 270 R32 refrigerant Heat pump Series TAW x R H C ...

Page 13: ...formation Product guide SMGB0135 rev 0 06 2020 5 1 1 4 2 Product guide 1 4 2 1 Outdoor unit 1 230V 50Hz Unit Code RAW 35RHC 60374825 1 4 2 2 Indoor unit 1 230V 50Hz Unit Code TAW 190RHC 70491001 TAW 270RHC 70491014 ...

Page 14: ...tion to work with ATW MBS KNX TAG 02 7E549943 ATW MBS 02 MODBUS gateway for YUTAKI YUTAMPO units 7E549924 ATW KNX 02 KNX interface for YUTAKI YUTAMPO units 7E549925 ATW TAG 02 Home automation gateway 70549926 AHP SMB 01 SmartBox Hi Box 70549919 NEW ATW OFC 02 Optional Function Connector Inputs and Outputs optional signals 7E549956 NEW ATW CP 05 Active Anode Cathodic Protection 7E549954 ...

Page 15: ... 1 Tank unit TAW 190 270 RHC 8 2 1 2 Outdoor unit RAW 35RHC 8 2 2 Name and function of control panel 9 2 3 Preparing for operation 11 2 3 1 Filling up the tank 11 2 3 2 Turning on the power 11 2 4 Setting the language 12 2 5 Setting the current time 12 2 6 Setting hot water temperature 13 ...

Page 16: ...ondensed water outlet Air inlet back and left side Air outlet CAUTION When heating operation drain or defrosted water flows out from outdoor unit Don t close drain outlet portion in chilly area so as not to freeze these NOTE Mg Anode should be changed yearly it may loose its function for corrosive protection if exceeds the time frame It is recommended to replace the Mg Anode every 1 year depending...

Page 17: ...YUTAMPO is in OFF state due to the timer That helps to differenciate if the YUTAMPO is in OFF state due to the timer or manual stop due to the Run Stop button avoiding any confusion about the reason for the stop NO LIGHT Manual OFF state RED OFF state due to an alarm GREEN ON state YELLOW OFF state due to the timer Menu button It is used to display the different configuration options of the contro...

Page 18: ... of the auxiliary DHW heater and Heat Pump if operation is possible to speed up DHW heating operation Unit status icons This part of the screen is used for the display of notification icons related to general status and operation conditions of the unit including icons such as Central operation Night shift or Compressor Outdoor temperature Alarm indication In normal operation the outdoor air temper...

Page 19: ...empty will overheat it and damage the unit Check carefully for leaks in the water circuit connections and circuit elements Check that the water pressure in the circuit is lower than 7 bars Fill the circuit with tap water Water that conforms to the drinking water regulation in each country must be used Do not use water from sources not subject to sanitary control like wells rivers or lakes since it...

Page 20: ...AMPO controller has 13 available languages Available languages English Español Français Italiano Deutsch Slovensko Português Dansk Nederlands Swedish Suomi Eλληvikά Hrvatski 2 5 Setting the current time After setting the language the LCD panel will show the date and time screen In this screen the date and time can be set in one of the available hour formats 12h AM PM or 24h ...

Page 21: ...pending on the hot water setting temperature Hot water temperature 55 C 55 75 C Heat pump operation ON 1 3 OFF Electric heater operation OFF ON 2 ON 1 Heat pump may not operate depending on the condition of outdoor temperature and tank water temperature Air temperature is below 15 C or above 37 C the heat pump does not operate for the compressor protection 2 Electric heater will operate in case th...

Page 22: ......

Page 23: ...st function 22 3 7 Emergency function 23 3 8 Night Shift Function 24 3 9 Circuit Pump DHW Recirculation function 25 3 10 Timers function 26 3 10 1 Setting of Simple timer 26 3 10 2 Setting of Schedule timer 26 3 11 Central Operation functions 27 3 12 Smart function 28 3 12 1 SG Ready Function 29 3 13 Energy configuration function 30 3 14 Pump down procedure function 31 3 15 Quick action function 3...

Page 24: ...power circuit Reset circuit Compressor drive circuit Outdoor DC fan motor drive circuit Outdoor microcomputer Overheat thermistor Defrost thermistor OutdoorTª thermistor EEPROM Oscillator clock circuit AR1 Indoor Outdoor interface circuit Outdoor unit Indoor unit YUTAMPO L N L N MC Mv MF Transmission and power Transmission and power Symbol Name AR1 Electrical heater Domestic Hot Water tank output ...

Page 25: ...starts when water temperature is lower than the values set for the beginning of operation of the heat pump the electrical heater or both as shown in the following sections The icon will appear during heating operation Thermo ON NOTE The defrost icon appears during defrosting Defrosting will be performed about once an hour when frost forms on the heat exchanger of the outdoor unit for 3 7 minutes e...

Page 26: ...n is adjusted to optimal efficiency for lower power consumption High Speed The heat pump is switched to maximum operation capacity to heat up the tank in the shortest time Setting for domestic hot water temperature selected by the user The maximum value of this setting depends on the Maximum setting temperature set by the installer Between 30 to maximum setting temperature Maximum value of DHW set...

Page 27: ... electrical heater operation since compressor start up High speed mode only In case of OFF waiting time of Electrical heater is not considered and heater will be switched ON with Heat Pump 3 4 1 High Demand Mode High Demand DHW heating operation starts if the differential is larger than differential temperature DHW can be heated up using the heater the heat pump or a combination of both Setting fo...

Page 28: ...ched for a specific period of time EH waiting time the electric heater starts to achieve this temperature DHW heating operation starts when the temperature of the water in the tank is low enough to start up the heat pump DHW is heated up with the heat pump or the electrical heater if the water setting temperature is up to 55ºC Setting for domestic hot water temperature selected by the user The max...

Page 29: ...ater Anti legionella mode uses the electrical heater The icon appears on the main screen It is possible to configure the following parameters Status of anti legionella operation enabled disabled Specified day for anti legionella operation Specified time of the day for anti legionella operation Setting for domestic hot water temperature in anti legionella operation Between 50 ºC to 75 ºC Duration o...

Page 30: ...f DHW Boost Push DHW Boost is triggered by pushing the quick action button Favourite button on the LCD controller Open NC DHW Boost is triggered by an external input relay which is normally closed NC Closed NO DHW Boost is triggered by an external input relay which is normally opened NO Setting for domestic hot water temperature in boost operation The maximum value of this setting depends on the M...

Page 31: ... mode is set up as manual the user shall switch ON the electrical heater on the emergency operation option Manual The electrical heater is switched ON manually by the user Automatic The electrical heater is switched ON automatically in case of malfunction of the outdoor unit In case of manually operation Emergency operation of Electrical Heater must be switched by ON OFF function ON Heater switche...

Page 32: ...n be configured from the LCD controller to be launched from the Favourite button Then Favourite button works like an ON OFF button When Night shift timer is enabled at the Night shift menu Favourite button lets start or stop the night shift function before the specified time The night shift cycle ends when the timer arrives to the stopping time The timer cycle starts again the next day When Night ...

Page 33: ...ation of the water pump for the re circulation of the hot water from the DHW tank by means of the heat pump This function can be used together with functions Disabled output is not used Enabled the output is enabled when DHW heat operation HP or Heater is enabled Anti Legionella output must be enabled when DHW for legionella operation HP or Heater is enabled Timer timer canbe programmed in order t...

Page 34: ...e screen The active schedule timers are shown in a weekly calendar Up to five timer events can be defined for each weekday and these can be used for turning the DHW heating operation on or off or to change the setting temperature for the DHW tank Pressing the OK key with one of the weekdays being selected in the weekly calendar screen displays the detailed schedule for the weekday The following pa...

Page 35: ...ssary to configure the control type local or full and the H LINK Address for the refrigerant cycle and the indoor unit In case that the YUTAMPO unit is connected a central operation device KNX Modbus etc Local Central orders are disabled Full Central orders are enabled H LINK communication addresses must be assigned in case that the YUTAMPO unit is connected to a central operation device Default v...

Page 36: ...s function can be used to block or limit the heat pump or increase demand due to electricity availability HP Block Heat Pump is forbidden in any condition SG Ready Smart Grid Ready operation Type of trigger for HP Block Closed Action when input is closed Open Action when input is open ...

Page 37: ...l technology by integrating the individual heat pump Allows in a smart grid by using two digital inputs establishing an unidirectional connection and allowed for four different operation modes SG Input 1 SG Input 2 Action Description Open Open Standard HP mode SG is not activated Close Open External blocking mode Heat Pump is forbidden when signal is active Open Close Low price mode Increase DHWT ...

Page 38: ...r The number of pulses of the power meter is a variable that must be set through the unit controller Status of the power meter data control Number of pulses per kWh of the power meter This parameter must be adjusted when connecting an external power meter Range 0 1 1 10 100 1000 pulse kWh After enabling the energy configuration it is necessary to select the appropriate input on the I O menu Input ...

Page 39: ...frigerant parts it is possible to collect the refrigerant to the outdoor unit by pump down procedure Configured time for the pump down procedure CAUTION After collecting the refrigerant through the pump down procedure function it s necessary to take the voltage out of the system so that the 4 way valve does not remain in cooling mode ...

Page 40: ... heat pump when restrictions in power supply must be observed SG 2 When using a Smart Grid Ready application this input is used as a digital input 2 allowing four different operating modes DHW Boost Manual request for immediate DHW heating operation Power Meter 1 Input used as kW h pulse count for the monitoring of energy data Forced OFF Forced OFF operation of the unit The remote control switch c...

Page 41: ... Detailed information about Heat Pump Outdoor Ambient Temperature Discharge Gas Temperature Evaporation Gas Temperature Inverter operation frequency Defrosting Unit Capacity Unit Type Shows a list of the alarm history of the system Detailed information about Energy Data Input Power Total month by month 3 18 Controller Settings Under the controller settings menu it is possible to adjust the several...

Page 42: ...n this section of the LCD controller it is possible to find the following information Unit type unit capacity controller firmware indoor PCB firmware and language package It is possible and recommendable to fill this information providing a contact phone to the user ...

Page 43: ...ve circuit 41 4 1 7 DC fan motor control circuit 42 4 1 8 Fan motor 43 4 1 9 Reactor 43 4 1 10 Compressor motor 44 4 1 11 Thermistor for outside air temperature Ta 45 4 1 12 Thermistor for overheat temperature Td 46 4 1 13 Thermistor for defrost HEX temperature Te 47 4 2 Indoor unit 48 4 2 1 Safety thermostat water temperature safety device 48 4 2 2 Electrical heater 49 4 2 3 DHW Thermistor 49 4 E...

Page 44: ...4 1 Outdoor unit 4 1 1 Power circuit 4 Electrical checks of main parts Outdoor unit SMGB0135 rev 0 06 2020 36 ...

Page 45: ...error of abnormal low speed switching failure Ip stop and others Diode stack DB601 These rectify the 230 VAC from terminal L and N to a DC power supply If diode stack DB601 are faulty DC voltage may not be generated and the compressor may not operate at all Also be aware that the 15A fuse might have blown Smoothing capacitors C021 C022 375 μF 420 V This smoothes averages the voltage rectified by t...

Page 46: ...e relay power relay inrush current relay motor current amplification 4 5V Power supply for microcomputer peripheral circuits Main parts Name Description C001 C002 C003 C004 C005 C011 C013 C014 NF1 These absorb electrical noise generated during operation of compressor and also absorb external noise entering from power line to protect electronic parts Surge absorber varistor 1 2 5 8 These absorbs ex...

Page 47: ...If the reversing valve is not powered or the conditions do not correspond to the appropriate ones for the operation mode it could indicate failure of the control circuit of the reversing valve 1 2 3 4 R441 R442 DB2 CN2 AC230V 28 27 12V 12V 28 29 Microcomputer Reversing valve 4 way Valve Cooling Heating switching relay coil RL4 Cooling Heating switching relay RL4 Reversing valve 4 way Valve relay R...

Page 48: ...changer drops abruptly Therefore the resistance of the DEF thermistor becomes high and the voltage at pin 70 of micro computer drops If this voltage becomes lower than the set value stored inside microcomputer will enter the defrost control During defrost operation the microcomputer will transfer the defrosting condition command to indoor unit via SD0 pin of interface of IF transmission output The...

Page 49: ...ges at pins 4 to 1 of CN15 are about 0 9V and 12V when no power is supplied When power is reset initial operation is performed for 10 or 20 seconds During initial operation measure all voltages at pin 4 to 1 of CN15 by using a multimeter If there is any pin with voltage that has not changed from 0 9V or 12V expansion valve or micro computer is broken Figure below shows logic waveform when expansio...

Page 50: ...At fair wind The rotational speed is controlled as it is At strong fair wind The rotational speed is not controlled as to protect the equipment and fan will rotate in the normal direction depend on the wind Automatically start when wind condition become weak Fan motor speed controller during unit operating There is a case where fan rpm is reducing during rotating caused by interference of strong w...

Page 51: ...ween pin 1 3 3 5 5 1 Normal value 20 50 Ω Replace electrical unit Replace fan motor Normal Normal Abnormal Abnormal Reconnect again fan motor connector CN24 NOTE Please confirm above checking procedure if found 2A fuse blown If fan motor is broken replace both electrical unit and fan motor CAUTION Beware of electric shock due to high voltage when conducting an operation check Power supply for DC f...

Page 52: ...M M M White U Red W Yellow V Resistance value 2 M 2 167 White U Yellow V Red W Compressor CAUTION When the refrigerating cycle has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant check the colour of the refrigerating machine oil inside the compressor If the colour has been changed conspicuously replace the com pressor ...

Page 53: ...020 45 4 4 1 11 Thermistor for outside air temperature Ta 28 36 16 31 9 78 6 09 3 92 2 60 1 78 1 24 0 89 0 65 0 48 0 36 0 28 0 21 0 5 10 15 20 25 30 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Thermistor resistance kΩ Temperature ºC ...

Page 54: ...t temperature Td 665 50 468 68 241 93 131 08 74 17 43 63 26 58 16 71 10 82 7 18 4 89 3 40 2 41 1 74 1 28 0 96 0 83 0 50 100 150 200 250 300 350 400 450 500 550 600 650 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 Thermistor resistance kΩ Temperature ºC ...

Page 55: ...hermistor for defrost HEX temperature Te 27 45 15 79 9 47 5 90 3 80 2 52 1 72 1 20 0 86 0 63 0 47 0 35 0 27 0 21 0 17 0 130 12 0 5 10 15 20 25 30 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 Thermistor resistance kΩ Temperature ºC ...

Page 56: ...vice 20A 250V L N N L 46 5 1 27 50 Ø 4 Ø 2 5 12 50 6 8 30 55 1 6 30x0 8 EN60730 15 4 0 3 2 7 1075 20 70 5 Ø Max 20 V D E 6 0 5 A1 A2 B1 B2 Reset button Threaded cap NUT S 1607 00 ELECTRIC DIAGRAM NC Disconnection temperature 90 5ºC Rated current 20 A RESET button The appliance can not connect again until the bulb doesn t fall 50ºC at least ...

Page 57: ...Ω 30 36 Ω Capacity 1 64 kW Power supply 1 230 V 50 Hz 4 2 3 DHW Thermistor 72 05 37 92 20 96 12 10 7 26 4 51 2 89 1 91 1 29 0 89 0 63 0 46 0 34 0 25 0 19 0 15 0 13 0 10 20 30 40 50 60 70 80 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 Thermistor resistance kΩ Temperature ºC ...

Page 58: ......

Page 59: ...it 53 5 2 1 Removing the service cover 53 5 2 2 Replacement of the LCD Controller 53 5 2 3 Replacement the PCB 54 5 2 4 Replacement of the electrical heater 54 5 2 5 Replacement of the thermistor 55 5 2 6 Replacement of the safety thermostat 55 5 2 7 Replacing the Mg Anode rod 56 5 Servicing SMGB0135 rev 0 06 2020 51 5 ...

Page 60: ...er there are flammable things around or not when using a burner for pipe connections if not oil existing pipe inside may ignite When performing brazing work besides security gloves it is a must to wear convenient eye protection In case of blocked or stacked parts use appropriated tools and eventually lubricants to release them In case of sharped edged parts as covers use security gloves to avoid g...

Page 61: ...e cover the parts inside the unit could be hot NOTE When reassembling proceed in reverse way than disassem bling Please note that for the maintenance operations described be low it will be necessary to remove the maintenance cover as a first step 5 2 2 Replacement of the LCD Controller 1 Insert the tip of a slotted screwdriver into the notches at the bottom of the holding bracket push and turn the...

Page 62: ...spacers x3 1 with long nose pliers and remove the PCB toward front side 1 NOTE When install new one proceed in reverse way than disassembling 5 2 4 Replacement of the electrical heater 1 Drain the DHW tank as explained in section Draining of the DHW 2 Remove the screws x4 1 of the heater cover 1 3 Unscrew and disconnect the electric wires N and L 1 from the heater 2 1 2 4 Unscrew and remove the el...

Page 63: ... thermistor 2 inside the sheath d Insert the thermostat bulb 3 inside the sheath 1 1 2 3 e Connect the thermistor to the PCB CN4 connector f Mount the heater cover and fix it with the screws x4 5 2 6 Replacement of the safety thermostat The safety thermostat is used in case of water gets too hot 1 Open the ebox and disconnect all the terminals connected to the thermostat 2 Remove the external nut ...

Page 64: ...ath 1 1 2 c Assembly the thermostat and fix it with the external nut d Connect all the terminals to the thermostat in the same position as it was originally and close the ebox e Mount the heater cover and fix it with the screws x4 5 2 7 Replacing the Mg Anode rod 1 Drain the DHW tank as explained in section Draining of the DHW in 7 Maintenance notes chapter 2 Remove the anode cover 1 3 Loosen the ...

Page 65: ... 6 1 4 Checking the electrical parts of the outdoor unit 64 6 1 5 Checking the refrigerant cycle 67 6 1 6 How to run the indoor unit with the outdoor unit test switch 68 6 1 7 Service Call Q A 69 6 2 Indoor unit 70 6 2 1 Operation 71 6 2 2 Troubleshooting by alarm code related to tank 72 6 3 Troubleshooting by protection code Outdoor unit 74 6 Troubleshooting SMGB0135 rev 0 06 2020 57 6 ...

Page 66: ...edure 1 Turn off the power 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to IPM 24 and IPM 20 terminals on the main PCB as shown in the figure below in order to discharge voltage in smoothing capacitor Do not use a soldering iron with transformer Otherwise thermal fuse inside transformer will...

Page 67: ...ton Horizontal with a insulation sleeve Pull out from top of insulation sleeve while pushing the release button Disconnecting on board connector On board connector with lock mechanism are widely used Please take note that by using a force to pull out with out releasing the lock mechanism can cause a damage Furthermore during inserting back the connector make sure it surely done Lock mechanism Rele...

Page 68: ...des that do not end up displaying the indoor unit lamp Any such mode may be unable to be stored if indoor or outdoor communications is in a failure The product stores 5 last stored failure modes There is a function for deleting memory Once you clear the memory and run the product for several days you can read the failure modes and check them thereby detecting the less frequent failure phenomena Fa...

Page 69: ...V P DC V Self check JW001 Self check JW002 CN24 LD301 Other check points Diagnosis for reversing valve operation error Check reversing valve wire connection either wire broken or not If it is OK check 3 15 A fuse If it is broken replace fuse or OU Controller When display the communication error or the outdoor do not run at all Please check the continuity of the indoor outdoor connecting cord F cab...

Page 70: ... the power off 2 Remove the outdoor fan motor s connector from CN24 3 Rotate the fan motor by hand and check whether the fan motor is locked or not 4 Measure the resistance between each terminal of the fan motor connector Normal resistance between each terminal 60 100 Ω 5 Insert the fan motor s connector ...

Page 71: ...r short circuit of thermistor wiring 3 Failure of the outdoor unit controller 1 Insert the connector properly 2 Replace the thermistor 3 Replace the outdoor unit controller 9 times Communication error 1 Wrong connection of the F cable 2 Disconnection of the F cable 3 Failure of the outdoor unit controller 4 Failure of the indoor unit controller 1 Connect the F cable properly 2 Replace the F cable ...

Page 72: ...nnection of the F cable Replace the outdoor electrical parts due to abnormality in the microcontroller or the EEPROM Release JW001 and JW002 Replace the outdoor electrical parts due to abnormality in the communication circuit Replace the outdoor electrical parts in the case of an abnormality in the communication circuit Fix the point of failure Is JW001 open Or is the circuit between JW001 and JW0...

Page 73: ... voltage between 264 and 358 V Refer to the label on the cover of the electrical parts for the measuring points Replace the outdoor electrical parts due to circuit abnormality Replace the outdoor electrical parts due to abnormality in the thermistor detection circuit Replace the outdoor electrical parts due to abnormality in the voltage detection circuit Yes LD301 blinks 5 times Yes Yes Yes Abnorm...

Page 74: ...electrical parts Replace the outdoor electrical parts Due to Q601 failure Change the outdoor ele unit Q601 abnormal Check whether foreign objects are inserted at the propeller fan or if there is any abnormality at the propeller fan Is the wind strong Check whether restart is possible It may take several minutes before restarting Check the outdoor fan motor For details see the page on the outdoor f...

Page 75: ...ox 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 seconds Compressor Gas leakage Possible malfunctioning part Blinks 3 times Blinks 4 times Blinks 5 times Blinks 6 times Blinks 8 times Lighting mode Charge port pressure MPa G kgf cm2 G Is the self diagnosis lamp mode as shown on the right Stop to operate and check the gas pressure in balancing mode R32 The values above are the the...

Page 76: ... 1 again For the initialization of the expansion valve it may take 1 min until the operation starts F2 F3 F4 Outdoor fan connector Test Service switch Compressor connector N DC V P DC V Self check JW001 Self check JW002 CN24 LD301 CAUTION Applying power directly to the outdoor unit will cause a rush current to stress the outdoor unit Before performing any of the service operations described in thi...

Page 77: ... louder This does not indicate a fault The compressor rotation speed changes according to the difference between the thermostat set temperature and water temperature This does not indicate a fault The temperature of the displayed water is a temperature lower in the tank A temperature upper in the tank might be high Water comes out of the outdoor unit After the ON OFF button is pressed to stop heat...

Page 78: ...load Failure of compressor or PCB P106 6 times Outdoor unit Stoppage by OH Thermistor High Temperature Incorrect wiring disconnected wiring broken cable sensor failure Pipe clogging excessive refrigerant innert gas mixing fan motor locking at cooling operation 107 P107 7 times Outdoor unit Thermistor Failure Thermistor disconnection short circuit Incorrect wiring disconnected wiring broken cable s...

Page 79: ...unit is installed overhead use a bush to connect a drain pipe to the water outlet to arrange proper discharge Water comes out of the tank unit When the temperature of in coming water is very low and the atmosphere around the tank is very humid dew may form on surface of the metal or piping and may drop Steam is coming out of the outdoor unit This is steam generated by frost melting during defrosti...

Page 80: ... displayed when the thermistor is short circuited greater than 100ºC or cut less than 10ºC when DHW is enabled This alarm forces all operations to stop Outdoor Indoor Units The unit should be stopped to release the alarm No Connect it Yes Yes No Is THMDHWT connected to CN4 pin 3 and pin 4 Faulty thermistor Change it Is resistance of THMDHWT between 0 25 kΩ and 21 kΩ Is the temperature of THMDHWT b...

Page 81: ...eater still working Check relay AR continuity Is there continuity to the heater thermostat Faulty PCB Change it Faulty realy AR Change it No No No No No Yes Yes Yes Yes Yes Alarm code 80 Communication failure between Indoor unit and LCD controller PC ARFTE The alarm code is displayed on the unit controller when there is no communication between indoor unit PCB and the unit controller for 90 second...

Page 82: ...e of heavy load Check the compressor for loose connectors and continuity of the cord Is a leakage breaker installed Is the insulation of the compressor normal Check it with a megger Replace the parts found to be defective based on the results of the self check evaluation Replace the compressor and inspect the outdoor electrical parts Fix the point of abnormality Conduct a self check Protection cod...

Page 83: ...nt of abnormality Open the service valve Conduct a self check Protection code P105 Lower limit of compressor overload Outdoor unit LED301 blinks 5 times This protection code is displayed 3 times before alarm 105 appears at the LCD controller LD301 blinks 5 times Yes Yes Abnormal Abnormal Normal Normal Yes Yes No No No No Exceeded the lower limit of overload Operation stopped due to heavy load of t...

Page 84: ...age by transmission error communication error Outdoor unit LED301 blinks 9 times This protection code is displayed continuously until the abnormal situation ends without leading to an alarm Yes No Check that the indoor timer lamp blinks Abnormal Normal Normal Blinks 3 times Blinks 12 times Check the indoor electrical parts Check the temperature fuse in the terminal board Fix the connection of the ...

Page 85: ...ality of the outdoor fan It may be a momentary interruption due to strong wind introduction of foreign objects in the propeller fan abnormality of the outdoor fan motor or abnormality of the drive circuit Check whether foreign objects are inserted at the propeller fan or if there is any abnormality at the propeller fan Is the wind strong Check whether restart is possible It may take several minute...

Page 86: ...talled Yes Yes Normal Abnormal Failure of Q601 Is the insulation of the compressor normal Replace the compressor and then check the outdoor electrical parts Replace the outdoor electrical parts Replace the outdoor electrical parts Due to Q601 failure Change the outdoor ele unit Q601 abnormal Protection code P115 Circuit abnormality Outdoor unit LED301 blinks 15 times This protection code is displa...

Page 87: ...High load stop Yes Abnormal Abnormal Normal Normal Yes Yes No No No No Is the heat exchanger of the outdoor unit clogged or are its surroundings blocked by something Is there any abnormality in the refrigerating cycle Is the service valve open Check the compressor for loose connectors and continuity of the cord Is a leakage breaker installed Is the insulation of the compressor normal Check it with...

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Page 89: ...7 Maintenance notes 7 Maintenance notes SMGB0135 rev 0 06 2020 81 7 Index 7 1 Maintenance work 82 7 1 1 Outdoor unit 82 7 1 2 Indoor unit 83 ...

Page 90: ...e refrigerant leakage at the piping connection between the outdoor and the indoor unit Pressure Check the R32 refrigerant pressure using the check joints of the outdoor unit 4 Cabinet Stain Check for any stain and remove it cleaning if it is the case Fixing screw Check for any loosened screw or any lost screw Fix the loosened screws and the lost screws Insulation material Check for any peeled ther...

Page 91: ...e heat exchanger 5 Electrical equipment Activation Check for an abnormal activation of the magnetic contactor the relay the PCBs and others Line condition Pay attention to the working voltage the working amperage and the working phase balance Check for any faulty contact that is caused by the loosened terminal connections the oxidized contacts the foreign matter and other items Check the electrica...

Page 92: ...alve of the DHW tank in order to fill the tank If there is a shut down valve installed in the DHW tank outlet open it to allow circulation through the DHW installation 4 When water begins to flow from the outlet water taps of the DHW installation close all these taps 5 Turn off all the connected mixer taps 6 Inspection a After filling the tank check all pipe heater and anode joints and the tank fo...

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Page 94: ...nmental Management systems accordance with the standard Hitachi certifies that our products have met EU consumer safety health and environmental requirements Johnson Controls Hitachi Air Conditioning Spain S A U Ronda Shimizu 1 Políg Ind Can Torrella 08233 Vacarisses Barcelona Spain ER 0198 1996 GA 1999 0044 Hitachi meets the requirements of the KEYMARK Certification Scheme See Heat Pump KEYMARK d...

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