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Haier 2HUM18HC03/R2 Service Manual

Ek series wall mounted type air conditioner
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HSM07HEKC03/R2(DB)
HSM09HEKC03/R2(DB)
HSM12HEKC03/R2(DB)
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death

SERVICE MANUAL

Model No.
WARNING
Haier Group

Wall mounted Type

DC Inverter
2HUM18HC03/R2(DB)
HSM07HEKC03/R2(DB)
HSM09HEKC03/R2(DB)
HSM12HEKC03/R2(DB)
2HUM18HC03/R2(DB)outdoor unit
©
(Qingdao Haier Air Conditioner General corp.,Ltd)
All right reserved .Unauthorized copying and distribution is a violation of law
Order No.
AC1012S002V0
EK-Series

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  Summary of Contents for Haier 2HUM18HC03/R2

  • Page 1: Service Manual

    © (Qingdao Haier Air Conditioner General corp.,Ltd) All right reserved .Unauthorized copying and distribution is a violation of law...
  • Page 2 2HUM18HC03/R2(DB)-SM of indoor unit main function and control specification of outdoor unit Removal of Air Filter Removal of Front panel Horiaontal Flap Vertical Blades and Swing Motor...
  • Page 3 2HUM18HC03/R2(DB) ............................9.10 Removal of Fan and Fan motor ................ 9.11 9.12 Removal of Left Side Plate ..............87 9.13 Removal of Fan motor and Bracket ............89 9.14 Removal of Right Side Plate..............93 9.15 Removal of Compressor and Heat Exhanger..........94...
  • Page 4: Safety Cautions

    2HUM8HC03/R2(DB)-SM Introduction 1. Introduction 1.1 Safety Cautions Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead to serious accidents under some conditions if they are not followed.
  • Page 5: Cautions Regarding Products After Repair

    2HUM18HC03/R2(DB)-SM Introduction Warning Do not repair the electrical components with wet hands. Working on the equipment with wet hands can cause an electrical shock. Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock.
  • Page 6 2HUM18HC03/R2(DB)-SM Introduction Warning Be sure to use an exclusive power circuit for the equipment, and follow the 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 can cause an electrical shock or fire.
  • Page 7: Inspection After Repair

    Introduction 2HUM18HC03/R2(DB)-SM Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.
  • Page 8 2HUM18HC03/R2(DB)-SM Introduction Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, fire or an electrical shock.
  • Page 9 2HUM18HC03/R2(DB)-SM HSM09/12HEKC03/R2(DB) Category Functions 2HUM18HC03/R2(DB) make your room full of an abundance natural negative ions. Healthy negative ion Avoid the child's wrong operation on the remote controller Child lock The 3D airflow is able to deliver the airflow horizontally and vertically.
  • Page 10: Specification

    2HUM8HC03/R2(DB)-SM 3 Specification 2HUM18HC03/R2(DB)(9+12)K 2HUM18HC03/R2(DB)(12+12)K 5.05(1.3~5.75) 5.7(1.73~6.45) 5.1(1.39~5.8) 5.7(1.91~6.6) 17200(4450~19600) 19450(5900~22000) 17400(4750~19800) 19450(6500~22500) 4343(1118~4945) 4902(1488~5547) 4902(1643~5676) 4386(1195 ~4988 1575(360~2050) 1570(440~2075) 1590(385~2065) 1570(490~2125) 3.63 3.21 3.21 3.63 9.52 9.52 30(double)20(single) 30(double)20(single) 7.5/8.0(7K/9K) 8.3/8.8(12K) 6.6/7.2(7K/9K) 7.2/7.8(12K) 6.1/6.6(12K) 5.7/6.4(7K/9K) 0.15 0.15 0.15 0.15 265×795×186...
  • Page 11 2HUM18HC03/R2(DB)-SM FV50S FV50S R410a R410a 1236 1236 1236 1236 1575 1590 1570 1570 688x810x288 688x810x288 745X949X406 745X949X406 43.5 43.5 46.5 46.5...
  • Page 12: Indoor Unit Connectors

    2HUM18HC03/R2(DB)-SM Connector wiring diagram 4.1 Indoor unit Connectors Connectors PCB(1) 1) CN26 Connector for fan motor 2) CN1 Connector for heat exchanger thermistor and Room temperature thermistor 3) CN11 Connector for UP&DOWN STEP motor 4) CON2 Connector for power N wire...
  • Page 13 2HUM18HC03/R2(DB)-SM Connector wiring diagram PCB(1) CN26 CN27 CN11 CN32 CN20 CON1 CON2 CON6 CN34 CON8 CON7 Domestic air conditioner...
  • Page 14 2HUM18HC03/R2(DB)-SM Connector wiring diagram 4.2: outdoor unit Connectors PCB(1) (Control PCB) 1) CN1,CN2 Connector for power N and L 2) CN3 Connector for ground 3) CN23 Connector for DC POWER 15Vand 5V to the module board 4) CN9,CN10 Connector for CN2,CN1 on the module board...
  • Page 15 2HUM18HC03/R2(DB)-SM Connector wiring diagram CN36 CN10 CN11 CN15 CN16 CN17 CN18 CN19 CN20 CN21 CN22 PCB(1) CN23 CN24 CN25 CN28 Domestic air conditioner...
  • Page 16 2HUM18HC03/R2(DB)-SM Connector wiring diagram CN11 CN10 PCB(2) Domestic air conditioner...
  • Page 17: Funcitions And Control

    2HUM18HC03/R2(DB)-SM Wiring diagrams 5.Funcitions and Control 5.1 Main functions and control specification of indoor unit 5.1.1 Automatic operation When the system is under the automatic operation option, the appropriate operation mode will be decided according to the differences between the preset temperature and the indoor temperature after the system starts up.
  • Page 18 2HUM18HC03/R2(DB)-SM Wiring diagrams Manus: When the system is operating, you can set the high, medium or low speed manually. ( When the sensor is on or off, the system will change the speed 2 seconds after receiving the signal.) *Airgate location control: the location for the airgate can be set according to your needs.
  • Page 19: Heating Operation Mode

    2HUM18HC03/R2(DB)-SM Wiring diagrams * timing system on/off function. * Dormant control function. 5.1.4 Heating operation mode. * temperature control range: 16---30 * temperature difference: * control feature: the temperature compensation is automatically added and the system will send the heating signals to the outdoor system.
  • Page 20: Mute Operation

    2HUM18HC03/R2(DB)-SM Wiring diagrams until the compressor has been started up for 30 seconds. The indoor temperature display will not change and the system operates at the cold air proof mode. * Automatic heating temperature compensation: when the system enters the heating mode, the temperature compensation (4) will be added.
  • Page 21 2HUM18HC03/R2(DB)-SM Wiring diagrams waiting mode. The light will be turned off when the timing is finished and the rest of the system will operate under a normal condition. The timing starts since the last reception of the timing singal. You can have the dormacy setting under the timing mode, the order of your settings will be operated according to the timing settings.
  • Page 22 2HUM18HC03/R2(DB)-SM Wiring diagrams 5.1.10 Urgent on/off input Press the urgency button the buzzer will ring. The system will enter the automatic mode if you don’t press the button for more than 5 seconds. Under the system off mode, if you press the urgency key for 5 to 10 seconds, the system will start the test operation.
  • Page 23 2HUM18HC03/R2(DB)-SM Wiring diagrams 5.1.13 abnormal operation of indoor system When the outdoor system operates, if the indoor system operation differs from the outdoor system, the abnormal operation malfunction will be reported. 10s after the report, the indoor system will be closed.
  • Page 24: Fixed Frequency Operation

    2HUM18HC03/R2(DB)-SM Wiring diagrams operate according to the set mode and neglect the communication signals of the outdoor system. However, it has to send signals to the outdoor system. * Quitting condition: This mode can be quitted after receiving the quitting signal from the remote control or urgency system.
  • Page 25: The Control System Of Outdoor Unit

    2HUM18HC03/R2(DB)-SM Wiring diagrams second—LED screen lights for 0.5 second— the step-in motor fully output for 0.5 second—then the motor doesn’t output for 0.5 second—the motor fully output again for 0.5 second. The test program finishes. 5.1.20 Time cutting function: connect the test program terminal on the mainboard after connecting the system to the power circuit.
  • Page 26 2HUM18HC03/R2(DB)-SM Wiring diagrams Serial Temperature scope Frequency limitation Wh_c<-12 Max_hz8 120 HZ Wh_c<-8 Max_hz7 120HZ Wh_c<-2 Max_h z4 120 HZ Wh_c<5 Max_hz5 120HZ Wh_c<12 Max_hz1 100HZ Wh_c<18 Max_hz2 56 HZ Wh_c> 18 Max_hz6 44 HZ Remarks: the above are the maximum frequency limitations of the complete appliance which are affected by the environment, and they have nothing to do with the ability of the indoor unit.
  • Page 27: The Outdoor Fan Control (Exchange Fan)

    2HUM18HC03/R2(DB)-SM Wiring diagrams The calculation of the actual output frequency: when there is no healthy airflow: F =F-ED-* P K When the healthy airflow has been set: F =F-ED-* P K airflow speed K healthy airflow When refrigerating, it is needed to satisfy <...
  • Page 28: Protection Function

    2HUM18HC03/R2(DB)-SM Wiring diagrams When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then begin initialization. The scope of refrigerationg valve 90-----480 steps The scope of heating valve 80-----480 steps The valves are adjusted according to the degree of superheat SHa.
  • Page 29 2HUM18HC03/R2(DB)-SM Wiring diagrams The compressor stops Fgh_t1 2 Fgh_t1 65 Decreasing the frequency rapidly Fgh_t2 Fgh_t2 2 P Decreasing the frequency slowly Fgh_t3 Fgh_t3 2 Q Prohibiting increasing the frequency Fgh_t4 Fgh_t4 2 R Increasing slowly Fgh_t5 Fgh_t5 2 Normal...
  • Page 30 2HUM18HC03/R2(DB)-SM Wiring diagrams When the outdoor environment temperature is higher than 50 ,AC current protection value decreases by 20AD 5.2.5.5 Antifreezing protection of the indoor heat exchanger When refrigerating/heating, prevent freezing. Tpg_indoor is the minimum value of the effective indoor unit (start it and it is in accord with the running state).
  • Page 31: Value Of Thermistor

    2HUM18HC03/R2(DB)-SM Wiring diagrams light shoud be off for 5 seconds. b) For the units’ malfunctins Annex 1 If there’s malfunction with the units, this will not affect the run of the complete appliance, but this can be displayed by the malfunction light, the light flashing frequency is 0.5HZ, the number of times is according to the malfunction table of the indoor units.
  • Page 32 2HUM18HC03/R2(DB)-SM Wiring diagrams 138.1285 124.3392 111.8256 -1.89 1.71 130.2371 117.4366 105.7989 -1.87 1.70 122.8484 110.9627 100.1367 -1.85 1.69 115.9272 104.8882 94.8149 -1.83 1.67 109.4410 99.1858 89.8106 -1.81 1.66 103.3598 93.8305 85.1031 -1.80 1.64 97.6556 88.7989 80.6728 -1.78 1.63 92.3028 84.0695 76.5017...
  • Page 33 2HUM18HC03/R2(DB)-SM Wiring diagrams 13.9436 13.4185 12.9017 -0.91 0.90 13.3431 12.8572 12.3778 -0.88 0.87 12.7718 12.3223 11.8780 -0.86 0.85 12.2280 11.8126 11.4011 -0.83 0.83 11.7102 11.3267 10.9459 -0.81 0.80 11.2172 10.8634 10.5114 -0.78 0.78 10.7475 10.4216 10.0964 -0.75 0.75 10.3000 10.0000 9.7000...
  • Page 34 2HUM18HC03/R2(DB)-SM Wiring diagrams 2.6232 2.4413 2.2700 -2.26 2.13 2.5396 2.3611 2.1932 -2.31 2.17 2.4591 2.2840 2.1195 -2.36 2.21 2.3815 2.2098 2.0486 -2.40 2.25 2.3068 2.1383 1.9803 -2.45 2.29 2.2347 2.0695 1.9147 -2.49 2.34 2.1652 2.0032 1.8516 -2.54 2.38 2.0983 1.9393 1.7908...
  • Page 35 2HUM18HC03/R2(DB)-SM Wiring diagrams 0.7059 0.6308 0.5632 -4.57 4.12 0.6877 0.6140 0.5478 -4.63 4.16 0.6700 0.5977 0.5328 -4.69 4.21 0.6528 0.5820 0.5183 -4.74 4.26 0.6361 0.5667 0.5043 -4.80 4.31 0.6200 0.5518 0.4907 -4.86 4.36 0.6043 0.5374 0.4775 -4.92 4.41 0.5891 0.5235 0.4648...
  • Page 36 2HUM18HC03/R2(DB)-SM Wiring diagrams 37.4465 35.0144 32.7108 -1.41 1.33 35.6202 33.3552 31.2062 -1.38 1.31 33.8936 31.7844 29.7796 -1.36 1.29 32.2608 30.2968 28.4267 -1.34 1.28 30.7162 28.8875 27.1431 -1.32 1.26 29.2545 27.5519 25.9250 -1.29 1.24 27.8708 26.2858 24.7686 -1.27 1.22 26.5605 25.0851 23.6704...
  • Page 37 2HUM18HC03/R2(DB)-SM Wiring diagrams 5.3916 5.1308 4.8783 -1.37 1.33 5.2001 4.9430 4.6944 -1.41 1.36 5.0163 4.7630 4.5185 -1.45 1.40 4.8400 4.5905 4.3500 -1.49 1.44 4.6708 4.4252 4.1887 -1.53 1.47 4.5083 4.2666 4.0342 -1.57 1.51 4.3524 4.1145 3.8862 -1.61 1.55 4.2026 3.9686 3.7443...
  • Page 38 2HUM18HC03/R2(DB)-SM Wiring diagrams 1.2583 1.1448 1.0405 -3.43 3.15 1.2226 1.1113 1.0092 -3.48 3.19 1.1880 1.0789 0.9789 -3.53 3.24 1.1546 1.0476 0.9497 -3.58 3.28 1.1223 1.0174 0.9215 -3.64 3.33 1.0910 0.9882 0.8942 -3.69 3.37 1.0607 0.9599 0.8679 -3.74 3.42 1.0314 0.9326 0.8424...
  • Page 39 2HUM18HC03/R2(DB)-SM Wiring diagrams 9687.0270 8074.3787 6724.1389 -2.88 2.41 9057.2314 7564.2244 6311.6413 -2.87 2.41 8472.2852 7089.4741 5927.0206 -2.86 2.40 7928.7217 6647.4547 5568.2222 -2.84 2.39 7423.3626 6235.7109 5233.3554 -2.83 2.39 6953.2930 5851.9864 4920.6791 -2.82 2.38 6515.8375 5494.2064 4628.5894 -2.80 2.37 6108.5393 5160.4621 4355.6078...
  • Page 40 2HUM18HC03/R2(DB)-SM Wiring diagrams 691.3524 622.3161 559.6694 -2.16 1.96 656.8979 592.1831 533.3634 -2.14 1.95 624.3328 563.6604 508.4261 -2.12 1.93 593.5446 536.6540 484.7796 -2.10 1.92 564.4275 511.0760 462.3510 -2.09 1.90 536.9865 486.9352 441.1516 -2.07 1.89 511.0105 464.0500 421.0258 -2.05 1.87 486.4151 442.3499 401.9146...
  • Page 41 2HUM18HC03/R2(DB)-SM Wiring diagrams 89.0211 85.0614 81.2048 -1.18 1.15 85.4976 81.7908 78.1744 -1.15 1.12 82.1303 78.6615 75.2715 -1.13 1.10 78.9116 75.6668 72.4902 -1.10 1.08 75.8343 72.8004 69.8249 -1.08 1.06 72.8916 70.0561 67.2703 -1.05 1.03 70.0770 67.4283 64.8213 -1.03 1.01 67.3844 64.9115 62.4731...
  • Page 42 2HUM18HC03/R2(DB)-SM Wiring diagrams 18.5157 17.4166 16.3680 -2.02 1.93 17.9590 16.8769 15.8458 -2.06 1.96 17.4214 16.3564 15.3427 -2.10 2.00 16.9023 15.8542 14.8577 -2.15 2.04 16.4010 15.3696 14.3902 -2.19 2.08 15.9167 14.9020 13.9394 -2.23 2.12 15.4489 14.4506 13.5047 -2.27 2.16 14.9968 14.0149 13.0855...
  • Page 43 2HUM18HC03/R2(DB)-SM...
  • Page 44: Installation

    2HUM18HC03/R2(DB)-SM Introduction 8 Installation Parts and Functions 7.TEMP display 8.POWER/SOFT display 9. HEALTH display 10. QUIET button 11. HEAT button 12. COOL button 13. AUTO button 14. FAN button 15. TIMER button 16. HEALTH button 17. LOCK button Used to lock buttons and LCD display 18.
  • Page 45: Emergency Operation

    2HUM18HC03/R2(DB)-SM Introduction Operation Emergency Operation: Use this operation only when the remote controller is defective or lost, and with function of emergency running, air conditoner Remote controller can run automatically for a while. When the emergency operation switch is pressed, the " Pi "...
  • Page 46: Sleep Operation

    2HUM18HC03/R2(DB)-SM Introduction Operation Sleep Operation 4. In FAN mode Before going to bed,you can simply press the SLEEP It has no SLEEP function. button and unit will operate in SLEEP mode and bring 5.Set the wind speed change when sleeping you a sound sleep.
  • Page 47 2HUM18HC03/R2(DB)-SM Introduction EUROPEAN REGULATIONS Operation CONFORMITY FOR THE MODELS All the products are in conformity with the following European provision: Set clock correctly before starting TIMER operation. - Low Voltage Directive 73/23/EEC 1.After unit starts, select your desired operation mode.
  • Page 48: Maintenance

    2HUM18HC03/R2(DB)-SM Introduction Maintenance Remote Controller Indoor Body Setting of proper room Do not block the air inlet temperature or outlet Proper wipe the air conditioner by using a temperature soft and dry cloth.For serious stains, use a neutral detergent diluted with Do not usewater,wipe the controller water.Wring the water out of the...
  • Page 49 2HUM18HC03/R2(DB)-SM Introduction Cautions WARNING Please call Sales/Service Shop for the Installation. Do not attempt to install the air conditioner by yourself because improper works may cause electric shock, fire, water leakage. WARNING Check proper When abnormality such as burnt-small found,...
  • Page 50: Troubleshooting

    2HUM18HC03/R2(DB)-SM Introduction Trouble shooting Cautions grille of the air Do not obstruct or cover the ventilation conditoner.Do not put fingers or any other things into the inlet/outlet and swing louver. Do not allow children to play with the air conditioner .In no...
  • Page 51: Service Diagnosis

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.Service Diagnosis 7.1 Caution for Diagnosis The operation lamp flashes 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, disabling equipment operation.
  • Page 52: Error Codes And Description Indoor Display

    7.3.Error Codes and Description indoor display Code indication Reference Outdoor Description Page indoor (LED1 flash times) Indoorand Outdoor Communication fault between indoor and Page .60 outdoor units Room temperature sensor failure Page .50 Indoor Malfunction Heat-exchange sensor failure Page .50 Indoor fan motor malfunction Page .52 i t c...
  • Page 53: Thermistor Or Related Abnormality

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.1 Thermistor or Related Abnormality Indoor Display E1: Room temperature sensor failure E2: Heat-exchange sensor failure outdoor display LED1 flash 10 times Frost-removing temperature sensor failure LED1 flash 11 times Suction temperature sensor failure LED1 flash 12 times Ambient temperature sensor failure...
  • Page 54: Eeprom Abnormal

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.2 EEPROM abnormal Indoor Display E4: indoor EEPROM error Indoor display F12: Outdoor EEPROM error ;Outdoor LED1 flash 1 times Method of The Data detected by the EEPROM are used to determine MCU Malfunction Detection Malfunction when the data of EEPROM is error or the EEPROM is damaged...
  • Page 55 2HUM18HC03/R2(DB)-SM Wiring diagrams or else parts damage may be occurred. Pull out the terminals on the indoor Check whether terminals mainboard and reinsert them. on indoor pcb is well ? Electrify the machine again and turn it on in the cooling operation,...
  • Page 56: Outdoor Dc Fan Motor Fault

    2HUM18HC03/R2(DB)-SM Wiring diagrams Outdoor DC fan motor fault 7.3.4 Check whether Terminal on the outdoor mainboard is well inserted. Reinsert the terminals Is it normal? Electrify the machine again and turn it on in the Cool state with the remote controller.
  • Page 57: Ipm Protection

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.5 IPM protection Outdoor display LED1 flash 2 times Method of IPM protection is detected by checking the compressor running condition and so on Malfunction Detection Malfunction The system leads to IPM protection due to over current...
  • Page 58: Over-Current Of The Compressor

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.6 Over-current of the compressor Outdoor Display LED1 flash 3 or 24 or 25 times Method of The current of the compressor is too high Malfunction Detection Malfunction when the IPM Module is damaged Decision or the compressor is damaged Conditions power supply.
  • Page 59: The Communication Fault Between Ipm And Outdoor Pcb

    2HUM18HC03/R2(DB)-SM Wiring diagrams Electrify the machine again and turn it on with the remote controller,If malfunctions IPM Module is damaged and reported before upon needs replacing. compressor being started up, The compressor is started normally, but malfunctions are reported after it Repair the power supply has run for some time.
  • Page 60 2HUM18HC03/R2(DB)-SM Wiring diagrams 1) Check whether Terminal CN23 and CN24 on the outdoor mainboard CN10 and CN11 on IPM module 2) Check whether the connected wire between IPM and outdoor 1) Pull out and reinsert the terminals. 2) Replace connected wire...
  • Page 61: Overheat Protection For Exhaust Temperature

    2HUM18HC03/R2(DB)-SM Wiring diagrams Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Electrify the machine again and turn it on with the remote controller. Check whether the...
  • Page 62: Wiring Diagrams

    2HUM18HC03/R2(DB)-SM Wiring diagrams Electrify the machine again and turn it on with the remote controller, then measure the temperature at the exhaust temperature sensor of the compressor on the outdoor unit 1) The cryogen may have been leaked during installation, or there may be leakage in the piping the temperature exceeds system.
  • Page 63: The Communication Fault Between Indoor And Outdoor

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.10 The communication fault between indoor and outdoor Indoor display outdoor display LED1 flash 15 times Method of Communication is detected by checking the indoor PCB and the outdoor PCB Malfunction Detection Malfunction The outdoor PCB broken leads to communication fault...
  • Page 64 2HUM18HC03/R2(DB)-SM Wiring diagrams Check the indoor mainboard. measure the voltage between Jumpers 3 and 4 of IC1 on the indoor mainboard with a multimeter. Test the outdoor power supply (230VAC and +310VDC) with a multimeter. If the voltage is of a constant...
  • Page 65: Loss Of Synchronism Detection

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.11 Loss of synchronism detection Inverter side current detection is abnormal Outdoor Display LED1 flash 18 times LED1 flash 19 times Method of The position of the compressor rotor can not detected normally Malfunction Detection Malfunction when the wiring of compressor is wrong or the connection is poor;...
  • Page 66: High Work-Intense Protection

    2HUM18HC03/R2(DB)-SM Wiring diagrams 7.3.12 High work-intense protection Outdoor display LED1 flash 21 times Method of High work-intense control is activated in the heating mode if the temperature Malfunction being sensed by the heat exchanger thermistor exceeds the limit. Detection Malfunction...