Haier 1U35MEHFRA-1 Service Manual
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Haier 1U35MEHFRA-1 Service Manual

Wall mounted type
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SERVICE MANUAL
Wall Mounted Type
F-Series
Model No. 1U35MEHFRA-1
WARNING
       
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
2017 (Qingdao Haier Air Conditioner General corp. , Ltd)
All rights reserved. Unauthorized copying and distribution is a violation of law
Haier Group
Version：V1
Date：2021-04-23
Domestic air conditioner

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  • Page 1 Repair the product or products dealt with in this service information by anyone else could result in serious injury or death 2017 (Qingdao Haier Air Conditioner General corp. , Ltd) All rights reserved. Unauthorized copying and distribution is a violation of law Haier Group Version：V1...

  • Page 2: Table Of Contents

    Contents Contents 1. Introduction ....................1 2. Specifications..................7 3. Sensors list ....................8 4. Piping diagrams ..................9 5. Operation range ..................10 6. Printed circuit board connector wiring diagram ........11 7. Functions and control................8. Dimensional drawings................9. Center of gravity ................... 10. Service diagnosis ................11.

  • Page 3: Introduction

    Introduction 1. Introduction 1.1 Model name explanation Apply toT1; 220~240V50HZ/1ph DC inverter Heat pump & R32 refrigerant Version number Europe Platform of outdoor units: NEW 1.5P p latform Nominal cooling capacity (12000BTU/h ) Type of outdoor unit : U (normal type) The maximum combination number Domestic air conditioner...
  • Page 4 Intuoduction 1.2 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 ●...
  • Page 5 Intuoduction When disconnecting the suction or discharge pipe of the compressor at the welded section, release the refrigerant gas completely at a well-ventilated place first. If there is a gas remaining inside the compressor , the refrigerant gas or refrigerating machine oil discharges when the pipe is disconnected, and it can cause injury.
  • Page 6 Intuoduction conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can cause an electrical shock, excessive heat generation or fire. When relocating the equipment, make sure that the new installation site has sufficient strength to withstand the weight of the equipment.
  • Page 7 Intuoduction itself is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters, stoves and ranges. When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent children from swallowing it.
  • Page 8 Intuoduction 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: Specifications

    Specification 2.Specifications NOMINAL DISTRIBUTION SYSTEM VOLTAGE ● Phase Frequency Voltage 220-240 NOMINAL CAPACITY and NOMINAL INPUT Cooling heating 3.50 4.20 Capacity rated Btu/h 11940 14330 ● Power Consumption(Rated) 0.87 SEER/SCOP 8.5/A+++ 4.6/A++ Annual energy consumption Moisture Removal m³/h 1.6*10 ﹣³ TECHNICAL SPECIFICATIONS-UNIT Dimensions H*W*D...

  • Page 10: Sensors List

    Specification exchanger Row*stage*fitch 2*24*1.4 TECHNICAL SPECIFICATIONS-OTHERS Refrigerant type Refrigerant charge 0.78 Refrigerant Maximum allowable distance circuit between indoor an outdoor Maximum allowable level difference ● Refrigerant control liquid Φ6.35 Piping connections Φ9.52 (external diameter) drain Φ16 ● Heat insulation type Both liquid and Gas pipes ●...

  • Page 11: Piping Diagrams

    Pinping diagrams 4 Piping diagrams Domestic air conditioner...

  • Page 12: Operation Range

    Operation range 5.Operation range Domestic air conditioner...

  • Page 13: Printed Circuit Board Connector Wiring Diagram

    Printed circuit board connector wiring diagram 6. Printed circuit board connector wiring diagram (Control PCB) Connector for power N and L Connector for ground Connector for the U, V, W wire of the compressor L-IN (CN5) Connector for reactor L-OUT (CN6) CN10 Connector for fan motor CN11...
  • Page 14 Functions and control Wiring diagrams OUTDOOR UNIT Domestic air conditioner...

  • Page 15: Functions And Control

    Functions and control 7. Functions and control 7.1 Main functions and control specification 7.1.1 The operation frequency of outdoor unit and its control 7.1.1.1 The operation frequency control of compressor The operation frequency scope of compressor Mode Minimum operation frequency Maximum operation frequency Heating 24Hz...
  • Page 16 Functions and control Wh_c<-2 Max_hz3 109HZ Wh_c<4 Max_hz4 102HZ Wh_c<10 Max_hz5 91HZ Wh_c<17 Max_hz6 79HZ Wh_c<20 Max_hz7 69HZ Wh_c> 20 Max_hz8 59HZ 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. Refrigeration/dehumidification mode: Serial No.
  • Page 17 Functions and control F-MIN-d(compressor’s Min_hz)< F<F-MAX-d(compressor’s Max_hz) When heating, it is needed to satisfy F-MIN-r (compressor’s Min_hz)< F<F-MAX-r (compressor’s Max_hz) PID control : The innital frequency Sn is determined by Pn . We can calculate Hzoutf according to the value of Kp ,Ki ,Kd, Out_gain,Pn.Then , Fn = Sn + Hzoutf.
  • Page 18 Functions and control 7.1.4 Four way control For the details of defrosting four-way valve control, see the defrosting process. Four way working in other ways: Under the mode of heating, open the four-way valve, when the compressor is not started or changed to non-heating mode, make sure the compressor is stoped for 2 minutes, and then close the four-way valve.
  • Page 19 Functions and control TC( ) The compressor stops Fgh_t1 63 Fgh_t1 2 Fgh_t2 2 N Decreasing the frequency rapidly Fgh_t2 60 P Decreasing the frequency slowly Fgh_t3 57 Fgh_t3 2 Fgh_t4—2 Q Prohibiting increasing the frequency Fgh_t4 52 R Increasing slowly Fgh_t5 40 Fgh_t5—2 Normal...
  • Page 20 Functions and control the compressor decreases at the speed of 0.1HZ/second. During the starting process of the compressor, if the AC current is greater than 7A, the frequency of the compressor increases at the prohibited speed. During the starting process of the compressor, if the AC current is greater than 6A, the frequency of the compressor increases at the speed of no faster than 0.1HZ/second.
  • Page 21 Functions and control modification rate. If during the course of weak magnetic control, the modification rate is still not high enough, enter into the control of decreasing frequency until the alarm of modification rate is relieved. 7.1.5.7 Temperature protection of the outdoor refrigerating coil When the defrosting temperature and the sensor’s temperature are higher than 68℃, the frequency of the compressor decreases 1hz/10seconds.
  • Page 22 Functions and control 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 -1.25 1.20 25.3193 23.9462 22.6273 -1.23 1.18 24.1432 22.8656 21.6361 -1.20 1.16...
  • Page 23 Functions and control 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 -1.65 1.59 4.0588 3.8287 3.6084 -1.70 1.62...
  • Page 24 Functions and control 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 -3.80 3.46...
  • Page 25 Functions and control 11096.6531 9212.8101 7641.8972 -2.91 2.42 10365.4565 8622.8491 7166.7474 -2.90 2.42 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...
  • Page 26 Functions and control 807.3024 723.4134 647.6580 -2.22 2.00 766.4212 687.8205 616.7252 -2.20 1.99 727.8172 654.1596 587.4271 -2.18 1.98 691.3524 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...
  • Page 27 Functions and control 104.8443 99.7046 94.7315 -1.28 1.23 100.6112 95.7939 91.1253 -1.25 1.21 96.5692 92.0553 87.6735 -1.23 1.19 92.7088 88.4805 84.3690 -1.20 1.17 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...
  • Page 28 Functions and control 21.6159 20.4303 19.2924 -1.81 1.74 20.9508 19.7825 18.6626 -1.85 1.77 20.3091 19.1582 18.0563 -1.89 1.81 19.6899 18.5564 17.4723 -1.93 1.85 19.0924 17.9761 16.9098 -1.98 1.89 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...

  • Page 29: Dimensional Drawings

    Dimensinal drawings 8.Dimensional drawings 9.Center of gravity ● Domestic air conditioner...

  • Page 30: Service Diagnosis

    Service diagnosis 10 Service Diagnosis 10.1 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. 2.
  • Page 31 Service diagnosis 10.2 Problem Symptoms and Measures Check the power supply. Check to make sure that the rated voltage is supplied. None of the units operates Check the indoor PCB Check to make sure that the indoor PCB is broken Operation A power failure of 2 to 10 cycles can stop air conditioner Check the power supply.
  • Page 32 Service diagnosis 10.3 Error Codes and Description indoor display Code indication Indoor displaying panel code indication Outdoor Referenc Only For 498 and (LED1 fault description e Page 498A display flash Other display (Red/Green Time Run times) □On★Flash■Off) Indoor Communication fault between indoor and outdoor units Page.42 ■...
  • Page 33 Service diagnosis 10.3.1 Thermistor or Related Abnormality ★ ■ ■/ E1: Room temperature sensor failure Indoor Display ★ □ □/ E2: Heat-exchange sensor failure Outdoor display LED1 flash 10 times：Defrost temperature sensor failure LED1 flash 11 times：Suction temperature sensor failure LED1 flash 12 times：Ambient temperature sensor failure LED1 flash 13 times：Discharge temperature sensor failure Method of...
  • Page 34 Service diagnosis 10.3.2 EEPROM abnormal ★ □ ★/ E4: Indoor EEPROM error Indoor Display ■ ★ ■/ F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times Indoor display Method of The Data detected by the EEPROM are used to determine MCU Malfunction Detection Malfunction...
  • Page 35 Service diagnosis 10.3.3 Indoor DC fan motor malfunction Indoor Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation Detection Malfunction when the detected rotation feedback signal don’t received in 2 minutes Decision Conditions Supposed...
  • Page 36 Service diagnosis 10.3.4 Outdoor DC fan motor fault ■ ★ □/ F8 Outdoor display LED1 flash 9 times Method of DC fan motor is detected by checking the fan running condition and so on Malfunction Detection Malfunction when the data of EEPROM is error or the EEPROM is damaged Decision Conditions ■...
  • Page 37 Service diagnosis Domestic air conditioner...
  • Page 38 Service diagnosis 10.3.5 IPM protection □ ★ ★/ F1 LED1 flash 2 times Outdoor display: 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 Decision The compressor faulty leads to IPM protection Conditions...
  • Page 39 Service diagnosis 10.3.6 Over-current of the compressor Outdoor Display: ■ ★ □/ F2 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.
  • Page 40 Service diagnosis 10.3.7 The communication fault between IPM and outdoor PCB ■ ★ ■/ F3 LED1 flash 4 times Outdoor display: Method of Communication is detected by checking the IPM module and the outdoor PCB Malfunction Detection Malfunction The outdoor PCB broken leads to communication fault Decision The IPM module broken leads to communication fault Conditions...
  • Page 41 Service diagnosis 10.3.8 Power Supply Over or under voltage fault Outdoor display: ■ ★ □/ F19 LED1 flash 6 times The power supply is over voltage Method of An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit. Malfunction Detection Malfunction...
  • Page 42 Service diagnosis 10.3.9 Overheat Protection For Discharge Temperature Outdoor display: ■ ★ ■ / F4 LED1 flash 8 times Method of The Discharge temperature control is checked with the temperature being detected Malfunction by the Discharge pipe thermistor Detection Malfunction when the compressor discharge temperature is above 110℃...
  • Page 43 Service diagnosis 10.3.10 The communication fault between indoor and outdoor ■ ■ ★/ E7 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. Decision The indoor PCB broken leads to communication fault.
  • Page 44 Service diagnosis If the voltage is a constant value The indoor mainboard is of 0V DC to 5V DC.Or the voltage damaged; replace it with a between Communication line(red ) and N(white new one. line) is not close to18V DC when only indoor charged. Test the outdoor power is Check the cable supply 230VAC with a...
  • Page 45 Service diagnosis 10.3.11 Loss of synchronism detection Inverter side current detection is abnormal ■ ★ ■\ F11 LED1 flash 18 times Outdoor Display ■ ★ ■\F28 LED1 flash 19 times Method of The position of the compressor rotor can not detected normally Malfunction Detection Malfunction...
  • Page 46 Service diagnosis 10.3.12 High work-intense protection ★ ★ ★\E9 LED1 flash 21 times Outdoor display 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 Activated when the temperature being sensed by the heat exchanger...

  • Page 47: Performance And Curves Diagrams

    Performance and ceves diagrams 11.1 Cooling capacity-temperature curves performance curves cooling value-temerature table indoor temp. DB/WB -20℃ -10℃ 0℃ 8℃ 15℃ 20℃ 25℃ 30℃ 35℃ 38℃ 40℃ 43℃ 21/15℃ 2245 2419 2580 2669 2617 2533 2392 3012 3287 3147 3077 2861 24/16℃...
  • Page 48 Performance and ceves diagrams 11.2 Cooling power consumption value- temperature curves performance curves power consumption value-temp.table indoor temp. DB/WB -20℃ -10℃ 0℃ 8℃ 15℃ 20℃ 25℃ 30℃ 35℃ 38℃ 40℃ 43℃ 21/15℃ 1027 1080 24/16℃ 1047 1140 27/19℃ 1129 1238 30/22℃...
  • Page 49 Performance and ceves diagrams 11.3 Cooling discharge pressure curves performance curves cooling discharge pressure.table outdoor temp. indoor temp. (humidity 46%) DB/WB 21/15℃ 27/19℃ 35/24℃ -20℃ 1260 1309 1375 -10℃ 1404 1443 1514 0℃ 1561 1603 1677 8℃ 1641 1737 1811 15℃...
  • Page 50 Performance and ceves diagrams 11.4 Cooling suction pressure curves performance curves cooling suction pressure.table outdoor temp. indoor temp. (humidity 46%) DB/WB 21/15℃ 27/19℃ 35/24℃ -20℃ -10℃ 0℃ 8℃ 15℃ 20℃ 25℃ 30℃ 35℃ 1020 38℃ 1041 40℃ 1145 43℃ 1075 1248 cooling suction pressure and temp.curves 1350...
  • Page 51 Performance and ceves diagrams 11.5 Heating capacity-temperature curves performance curves heating capacity and indoor/outdoor temp.table indoor temp.(humidity 46%) outdoor temp. DB/WB 10℃ 20℃ 27℃ -25℃ 2654 2226 2005 -20℃ 2920 2449 2123 -15℃ 3229 3008 2654 -10℃ 3672 3357 3097 -7/-8℃...
  • Page 52 Performance and ceves diagrams 11.6 Heating power consumption value- temperature curves performance curves power consumption value-temp.table outdoor temp. indoor temp.(humidity 46%) DB/WB ℃ ℃ ℃ ℃ 1174 1244 ℃ 1080 1271 1347 ℃ 1169 1328 1408 ℃ 1281 1424 1495 ℃...
  • Page 53 Performance and ceves diagrams 11.7 Heating discharge pressure curves performance curves heating discharge pressure.table indoor temp. outdoor temp DB/WB 10℃ 20℃ 27℃ -25℃ 2010 2083 2198 -20℃ 2285 2430 2491 -15℃ 2463 2621 2734 -10℃ 2882 3020 3155 -7/-8℃ 3136 3297 3451 2/1℃...
  • Page 54 Performance and ceves diagrams 11.8 Heating suction pressure curves performance curves heating suction pressure.table indoor temp. outdoor temp DB/WB 10℃ 20℃ 27℃ -25℃ -20℃ -15℃ -10℃ -7/-8℃ 2/1℃ 7/6℃ 12/11℃ 18/16℃ 1009 1049 1069 24/20℃ 1195 1235 1255 heating suction pressure and temp. curves 1400 1300 1200...
  • Page 55 Circuit diagrams   12.Sound level Sound pressure level 230V,50HZ Sound power level Model Measuring location (cooling/heating) Cooling/heating microphone 1U35MEHFRA-1 Domestic air conditioner...

  • Page 56: Circuit Diagrams

    ircuit Diagra 12. Circuit diagrams 12.1 Outdoor unit control board circuit diagrams omestic air conditioner...
  • Page 57 Circuit diagrams Sincere Forever Haier Group Edited by : Shi haiyan Haier Industrial Park, No.1, Haier Road ● Wang wanli 266101, Qingdao, China_ Signed by : Yang Wenjun Http：//www.haier.com Approved by: W u Hongjin Domestic air conditioner...
  • Page 58 Wall Mounted Type DC Inverter FREE MATCH NEW1.5P-Series SERIES:NEW1.5P...
  • Page 59 Remove of front panel Outdoor unit Loosen the service Be careful not to cover screw and cut your finger by remove the service the fins of the cover. heat exchanger Domestic air conditioner...
  • Page 60 Step Procedure Step Procedure Points Step Procedure Points Points 2. Remove the panels. Loosen the 7 screws and lift the top panel Loosen the screws of the panel. Pull and remove the front panel. Domestic air conditioner...
  • Page 61 Remove the fixting screws, then lift the electrical box Domestic air conditioner...
  • Page 62 Remove the air filters and horizontal flap Loosen the fixting screws and remove back protect net . ■ Loosen the fixting screws and remove the side panel. Domestic air conditioner...
  • Page 63 Remove the casing Loosen the fixting screws and remove the side panel. ■ Loosen the fixting screws and remove the cross beam. Domestic air conditioner...
  • Page 64 Loosen the fixting screws remove the fan Loosen the fixting screws and lift the fan motor. Domestic air conditioner...
  • Page 65 Release stepping motor (2type) Remove fixing screws,then lift the fan motor bracket Cut down and pull out compressor and remove Domestic air conditioner...
  • Page 66 Removal of Heat Exchanger Loosen the marked fixing screws Loosen the fixting hook Domestic air conditioner...
  • Page 67 Remove fixing screw,then lift valve set Domestic air conditioner...

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