Haier MRV 5 Series Troubleshooting Manual
  1. Manuals
  2. Brands
  3. Haier Manuals
  4. Air Conditioner
  5. MRV 5 Series
  6. Troubleshooting manual

Haier MRV 5 Series Troubleshooting Manual

Hide thumbs Also See for MRV 5 Series:
Table of Contents

Advertisement

Quick Links

Advertisement

Table of Contents
loading

Related Manuals for Haier MRV 5 Series

Summary of Contents for Haier MRV 5 Series

  • Page 1 Trouble Shooting...
  • Page 2 DC fan motor failure..............................34 High pressure switch off failure..........................40 Indoor unit overload..............................52 Temperature sensor failure............................62 Part 2. MRV 5 series trouble shooting 1.Trouble Shooting Commnunication between indoor and wired controller failure..................70 Communication between DC fan motor and indoor PCB failure................79 Communication between indoor and display board failure..................82...
  • Page 3 R32 series Trouble Shooting 1. 4-way valve reversing failure.............................1 2. Communication error between indoor and oudtoor unit...................9 3. Communication error between power module and PCB..................18 4. Compressor start failure............................27 5. DC fan motor failure..............................34 6. High pressure switch off failure..........................40 7.
  • Page 4 4-way valve reversing failure...
  • Page 5 Digital tube indication on outdoor unit (Small service PCB) Monday Error Code 10:30 2011.11.03 Indication on YR-E16A 20/08/2014 11:20 Current error Error code: Return Enter Main 4-way valve reversing failure Indication on YR-E17 Indication on round panel Indication in duct unit LED4 flash 3 times LED3...
  • Page 6 Troubleshooting Items Connection position 1. Check the wiring connection between 4-way valve and PCB Connection status 2. Check the 4-way valve coil 3. Check if the 4-way valve leaks inside 4. Check the coil resistance 5. Check CN5 voltage in PCB...
  • Page 7 Check if the wiring connection between the 4-way stop valve and PCB is good. Reconnection...
  • Page 8 Check if the 4-way stop valve coil is fixed well Reconnect the coil...
  • Page 9 Power again，feel the 4-way valve temperature, check if the temperature as below photo Replace the 4-way valve TIPS: Check method： Power again, in cooling mode, touch the 4 pipes of the 4-way valve by hand, if the pipe temperature feels as shown, the 4-way valve is normal;...
  • Page 10 Check if the coil resistance of 4-way valve is normal Replace the coil 20KΩ 2.1±0.2KΩ...
  • Page 11 Power on again, check if the voltage value about CN5 in PCB is AC 220~240V Replace the outdoor PCB...
  • Page 12 Communication error between indoor and outdoor unit...
  • Page 13 Digital tube indication on outdoor unit Monday Error Code 10:30 2011.11.03 Indication on YR-E16A Current error Error code: 20/08/2014 11:20 Return Enter Main Communication error between indoor and outdoor unit Indication on YR-E17 Indication on round panel LED4 flash 3 times Indication in duct unit LED3 flash 5 times...
  • Page 14 Troubleshooting items 1. Check the wiring connection sequence 2. Check connection wire conductive 3. Check the indoor unit error 4. Switch the connection wire 5. Check the outdoor unit wiring connection 6. Check the indoor unit wiring connection...
  • Page 15 Check if the wiring connection sequence between indoor and outdoor unit is correct change the wiring sequence Outdoor unit Indoor Note: unit Outdoor unit terminal A===Indoor unit teriminal A Outdoor unit terminal B===Indoor unit teriminal B Outdoor unit terminal C===Indoor unit teriminal C Outdoor unit terminal D===Indoor unit teriminal D Outdoor unit...
  • Page 16 Check if the connection wire between indoor and outdoor unit is conductive Replace the connection wire...
  • Page 17 Check if all the indoor unit is error the outdoor unit is error PCB display in duct unit Outdoor unit Panel of Round way Running lamp flash cassette indication Running light(LED3) Small service PCB time(LED4) LED1,LED2..(light or not)
  • Page 18 Digital tube indication on outdoor unit If not all indoor units are error, switch the connection wire Monday between the abnormal indoor Error Code 2011.11.03 unit and normal indoor unit , 20/08 Indication on YR-E16A Current error Error code: and check whether the fault is relieved Return Enter...
  • Page 19 According to wiring diagram to check if the outdoor unit is correct. Reconnect If connection correct, please replace the outdoor PCB...
  • Page 20 According to wiring diagram to check if the indoor unit is correct. Reconnection If connection correct, please replace the indoor PCB...
  • Page 21 Communication error between power module and PCB...
  • Page 22 Digital tube indication on outdoor unit( small service PCB) Monday 10:30 Error Code 2011.11.03 Indication on YR-E16A) Current error Error code: 20/08/2014 11:20 communication error between Return Enter Main power module and PCB Indication on wired controller (YR-E17) Indication on round panel of cassette LED4 flash 2 times...
  • Page 23 Check if the supply wiring connection between PCB and power module is ok Reconnect Reconnect...
  • Page 24 Check if the communication wire between PCB and power module is normal. Reconnect...
  • Page 25 Check if the CN9 of PCB is DC15V Replace PCB DC 20V...
  • Page 26 Check if the power module is bad Replace the power module...
  • Page 27 No burned Burning loss Step1: Check the appearance of the power module point 1 AC-L Step2: point 2 Measure point 3 Power off, use the multimeter diode mode to check : Point 1（red wire)→Point 2(black wire): open Point 2（red wire)→Point 1(black wire): approx 0.5V point4 Point 4（red wire)→Point 2(black wire): approx 1V Point 2（red wire)→Point 4(black wire): open...
  • Page 28 Power on, measuring the voltage value of CN10 with a multimeter DC20V 3&2 : 5V 1&2:15V Step3: measure Power off, the right measure method and value as below： Power off, the right measure method and value as below： U(Red wire)→ P(black wire): 0.4~0.7V N(Red wire)→...
  • Page 29 Power off, use the multi method and value as below： 1(Red wire)→ 2(black wire): approx 0.5V 2(Red wire)→ 1(black wire):infinity 1(Red wire)→ 3(black wire): approx 0.5V 3(Red wire)→ 1(black wire): approx 1.6V 3(Red wire)→ 2(black wire): approx 1.9V 2(Red wire)→ 3(black wire): infinity...
  • Page 30 Compressor start failure...
  • Page 31 Digital tube indication on outdoor unit (Small service PCB) Monday 10:30 Error Code 2011.11.03 Current error Error code: 20/08/2014 11:20 Indication on YR-E16A Return Enter Main Compressor start failure Indication on wired controller (hex) Indication on round panel LED4 flash 4 times Indication in duct unit LED3 flash 7 times...
  • Page 32 Troubleshooting items 1. Check the resistance of compressor 2. Check the power module 3. Replace the compressor...
  • Page 33 Check if the resistance between U V W of the compressor is correct. Replace the compressor 200Ω 200Ω Resistance Part code Model standard 200Ω 1.91Ω (20°C) 0010722555A 3U55S2SR2FA 3U70S2SR2FA 0.88Ω (20°C) 0010723245A 4U75S2SR2FA 4U85S2SR2FA...
  • Page 34 Replace the power module to check if it starts. Replace the compressor. Replace the power module, if the compressor is not ok, replace the compressor.
  • Page 35 Check if the wiring connection between power module and compressor is correct. Reconnect...
  • Page 36 Check if the wiring connection sequence between compressor compressor and connection wire Reconnect...
  • Page 37 DC fan motor failure...
  • Page 38 Digital tube indication on outdoor unit( small service PCB) Monday Error Code 10:30 2011.11.03 Indication on YR-E16A 20/08/2014 11:20 Current error Error code: Return Enter Main DC fan motor failure Indication on wired controller (YR-E17) Indication on round panel of cassette Indication in duct unit LED4...
  • Page 39 Troubleshooting items 1. Check the fan motor wire resistance and connection positon 2. Rotate the fan motor by hand 3. Power on, check voltage of CN11 in...
  • Page 40 Power off,check if the fan motor is fixed well with PCB terminal, and check if the resistance of the fan motor terminal is normal Reconnect or replace the fan motor Use the multimeter to measure the resistance CN11 1(red wire)→2(black): approx 1MΩ 3(red wire)→2(black): approx 48KΩ...
  • Page 41 Rotate the fan motor by hand . Check if the fan motor can rotate normally and if it is with noise Replace motor without noise...
  • Page 42 Power on, check if the CN11 voltage of the PCB connecting with fan motor is normal Replace PCB +310V(red wire)→PGND(black): 310±20V Note: +310V is DC 310V to fan motor from PCB. PGDD is ground. 1000V If the voltage is abnormal, replace PCB.
  • Page 43 High pressure switch off failure...
  • Page 44 Digital tube indication on outdoor unit( small service PCB) Monday Error Code 10:30 2011.11.03 20/08/2014 11:20 Indication on YR-E16A Current error Error code: Return Enter Main Communication error between indoor and outdoor unit Indication on YR-E17 Indication on round panel of cassette LED4 flash 6 times...
  • Page 45 Troubleshooting Items 1. Check the wire connection between high pressure switch and PCB 2. Check if the high pressure switch wire is conductive 3. Check if the stop valve is open 4. Check if the EEV is open 5. In heating mode, check if the air duct length is too long 6.
  • Page 47 The multimeter is beep, line conduction...
  • Page 48 closed Open...
  • Page 49 Check if the EEV is open Check if the EEV is open, there are two methods: method 1: listen,if there is some sound in the EEV method 2: check the monitor software.
  • Page 50 In heating mode, check if the air duct length is too long Modify the air duct. The air duct length: low ESP duct unit: less than 3m med ESP duct unit: less than 15m...
  • Page 51 In cooling, check if the condenser is dirty; in heating ,check if the evaporate is dirty. Replace the condenser or evaporate...
  • Page 52 Indoor unit fan motor Outdoor unit fan motor...
  • Page 53 Check if the ambient temperature exceeds the working range. Running in the normal temperature range.
  • Page 54 When the unit stops, use the pressure gauge to measure the pressure at the stop valve and to check if the pressure exceeds saturation pressure Recycling refrigerant, evacuate, recharge refrigerant.
  • Page 55 Indoor unit overload...
  • Page 56 Digital tube indication on outdoor unit (Small service PCB) Monday Error Code 10:30 2011.11.03 Indication on YR-E16A Current error Error code: 20/08/2014 11:20 Return Enter Main Indoor unit overload Indication on YR-E17 Indication on round panel LED4 flash 4 times Indication in duct unit LED3 no flash...
  • Page 57 Troubleshooting items 1. Check the coil temp. sensor resistance 2. Check the air duct and inlet and outlet of the unit 3. Check stop valve 4. Check the coil of the EEV 5. Check outdoor ambient temperature 6.Check the coil temp.sensor fixing 7.
  • Page 58 Check if the coil temp. sensor resistance is normal Replace the coil temp .sensor...
  • Page 59 R25=10KΦ±3% B25/50=3700K±3% R25=10KΦ±3% B25/50=3700K±3% Rnom(KΦ) Rnom(KΦ) T(°C) T(°C) 90.79 7.83 85.72 7.52 7.23 80.96 76.51 6.95 72.33 6.68 5.43 68.41 64.73 61.27 5.59 5.73 58.02 54.97 5.52 5.32 52.1 49.4 5.12 4.93 46.86 44.46 42.21 4.58 40.08 4.42 38.08 4.26 36.19 4.11 34.41...
  • Page 60 Check if the air duct is unimpeded, if the air duct is too long, if the the inlet and outlet are unimpeded. Modify the air duct , inlet &outlet of the unit The air duct length: low ESP duct unit: less than 3m med ESP duct unit: less than 15m...
  • Page 61 Check if the stop valve is open Open the stop valve...
  • Page 62 Check if the coil of the EEV is connection normal. Reconnect...
  • Page 63 Check if the outdoor ambient temperature exceeds the normal temperature range during heating. Running in the normal temperature range 50°C Heating temperature range: -15~24℃...
  • Page 64 Check if the coil temp.sensor is fixing well. Reconnect PCB code:0151800106E CN13 PCB code:0151800267...
  • Page 65 Temperature sensor failure...
  • Page 66 Troubleshooting items 1. Check sensor position and connection 2. If the sensor resistance is correct 3. If the PCB is good...
  • Page 67 Indication on Fault Outdoor Indication on LED4 LED3 Indication on wired controller possible wired controller flash flash display round Panel reasons display (YR-E17) times times (YR-E16A) ROOM Monday Error Code 10:30 Malfunction of 2011.11.03 20/08/2014 11:20 Current error Error code: defrosting temp.
  • Page 68 Indication on Fault Outdoor Indication on LED4 LED3 Indication on wired controller possible wired controller flash flash display round Panel reasons display (YR-E17) times times (YR-E16A) Monday Error Code 10:30 Gas pipe temp. ROOM 2011.11.03 Current error Error code: 20/08/2014 11:20 sensor for indoor Return Enter...
  • Page 69 Check if the temperature sensor is fixed well Reconnect...
  • Page 70 Check if the sensor characteristic is correct Replace the sensor if the sensor characteristic is correct, Test position replace the PCB Part code Part name Characteristic R25=10KΩ 0150402454 Gas liquid sensor R25=10KΩ 0150402521 Defrost temperature sensor R25=10KΩ 0150402453A Gas liquid sensor R80=50KΩ...
  • Page 71 R25=10KΦ±3% B25/50=3700K±3% R25=10KΦ±3% B25/50=3700K±3% Rnom(KΦ) Rnom(KΦ) T(°C) T(°C) 90.79 7.83 85.72 7.52 7.23 80.96 76.51 6.95 72.33 6.68 5.43 68.41 64.73 61.27 5.59 5.73 58.02 54.97 5.52 5.32 52.1 49.4 5.12 4.93 46.86 44.46 42.21 4.58 40.08 4.42 38.08 4.26 36.19 4.11 34.41...
  • Page 72 MRV 5 series trouble shooting Commnunication between indoor and wired controller failure..................70 Communication between DC fan motor and indoor PCB failure................79 Communication between indoor and display board failure..................82 DC fan motor failure..............................89 DC motor model is wrong............................95 Fan module commnication failure..........................98 Fan module hardware overcurrent.........................103...
  • Page 73 Communication between indoor and wired controller failure...
  • Page 74 Central controller display YCZ-A004 HCM-05 BMS display Communication between indoor and wired controller failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 7 times...
  • Page 75 Troubleshooting items The communication wire is standard 1. Check the wiring connection Connection method 2. Check the dip switch setting 3. Check the transformer 4. Check the wired controller...
  • Page 76 Power-on, check if the screen of the wired controller is bright. Check the power supply of the wired controller...
  • Page 77 There is 11.5VAC between the white terminals Transformer AC 20V There is 13.7VAC between the blue terminals Transformer AC 20V Standard：the voltage between A and B is AC12V If the transformer and the PCB are OK, replace the wired controller...
  • Page 78 Check if the communication wire is standard Replace the communication wire 1.The singal line is polarity 2.The singal line diameter and length Length of singal line (m) Wiring dimensions ≤ 250 0.75 mm x3 core shielded line ※ The shielding lay of the signal line must be grounded at one end. ※...
  • Page 79 Check if the indoor dip switch setting of SW01 is right Adjust the dip switch setting Indoor PCB: 0151800113 / 0151800161C / 0151800086A / 0010451751AF / 0151800141A / 0151800227 / 0151800227A / 0151800244 / 0151800244B / 0151800244BA Wired control address OFF OFF OFF OFF Master unit in group control SW01_1...
  • Page 80 Check if the communication method is right? Reconnect A. One wired controller controls one indoor unit the wired controller connects with the ABC teminal of indoor unit. Indoor Indoor P Q A B C P Q A B C Wired Wired Wired A B C...
  • Page 81 Type Series Model PCB Code Schematic diagram AB*MCERA 4-way Cassette 0151800113 AB*MCERA(C) 2-way Cassette AB*MBERA 0151800161B AC*MCERA Convertible 0151800113 AC*MFERA Slim Low ESP Duct 0151800161C AD*MSERA The slave unit only connects BC terminal Low ESP Duct 0151800113 AD*MLERA Indoor Indoor Indoor P Q A B C P Q A B C...
  • Page 82 Communication failure between DC fan motor and indoor PCB...
  • Page 83 Central controller display YCZ-A004 HCM-05 BMS display Communication failure between DC fan motor and indoor PCB HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 16 times...
  • Page 84 Troubleshooting items 1. Check the wire connection 2. Check the indoor PCB 3. Check DC fan motor...
  • Page 85 Check if the wire of fan motor connects well Reconnect 0151800244PCB...
  • Page 86 Replace the fan motor, check if the error disappear Replace the...
  • Page 87 Communication between indoor and display board failure...
  • Page 88 Central controller display YCZ-A004 HCM-05 BMS display Communication between indoor and display board failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 10 times...
  • Page 89 Troubleshooting items 1. Check the communication wire 2. Check the indoor PCB 3. Check the display board...
  • Page 90 Check if the wire connection between the display board and indoor PCB is right Adjust the wires DC 12V DC 12V...
  • Page 91 If replace the indoor PCB can solve the problems Replace the display board...
  • Page 92 DC motor failure...
  • Page 93 Central controller display YCZ-A004 HCM-05 BMS display Indoor unit DC motor failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 14 times...
  • Page 94 Troubleshooting items 1. Check the wire connection 2. Check the indoor PCB 3. Check DC fan motor speed...
  • Page 95 Check if the wire of fan motor connects well Reconnect...
  • Page 96 Power on, FAN mode, check if the motor can run normally Check if the power supply of the motor is normal. Note: 1. 310V is 310v DC to fan motor from pcb 2. PGND is gound 3. 15V is 15vdc to fan motor from 310V 4.
  • Page 97 If the fan can run normally, check if the fan speed is consistent with the target speed. (1) Set the indoor unit to run at the highest speed or the lowest speed, and check if the fan speed is normal. (2) Measuring the speed by tachometer and comparing it with the theoretical speed...
  • Page 98 DC motor model is wrong...
  • Page 99 Central controller display YCZ-A004 HCM-05 BMS display DC motor model is wrong HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 13 times...
  • Page 100 Check if the capacity dip switch setting is consistent with the actual indoor model Adjust the dip switch setting Note: This failure code only applies to constant air volume duct (AD*2MQERA) 0151800244 PCB Capability of indoor unit 0.6HP(AD052MSERA(D)) 0.8HP (AD072MQERA) 1.0HP (AD092MQERA) SW01_5 Capability of...
  • Page 101 Fan module communication failure...
  • Page 102 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Fan module communication failure Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 20 times...
  • Page 103 Troubleshooting items Connection position 1. Check the wiring connection Connection status 2. Check the power module 3. Check the fan motor...
  • Page 104 Check if the wire connection between the outdoor PCB - power module - fan motor is correct Reconnect or replace bad wires Outdoor PCB Power module Power module Outdoor PCB Power module Power module...
  • Page 105 Check if the power module is bad Replace the power module Checking the power module refer to If the power module is good, "power module inspection" replace the fan motor...
  • Page 106 Fan module hardware overcurrent...
  • Page 107 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Fan module hardware overcurrent Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 20 times...
  • Page 108 Troubleshooting items 1. Check the power supply voltage Connection position 2. Check the wiring connection Connection status 3. Check the fan motor 4. Check the capacitor board...
  • Page 109 Check if the power supply voltage is normal Adjust power supply Measuring the power supply Measuring the power supply voltage between L1 and L2 voltage between L1 and L3 Measuring the power supply voltage between L2 and L3 TIPS: The power supply voltage between L1/L2/L3 is AC 380V±10%...
  • Page 110 Check if the wire connection between the outdoor PCB-power module-fan motor is correct Reconnect or replace bad wires Outdoor PCB Power module Power module...
  • Page 111 Rotating the fan motor shaft by hand, if it can rotate Replace the fan motor If the fan motor can't rotate, replace the fan motor...
  • Page 112 Check if there is DC 540V voltage output on the capacitor board Replace the capacitor board DC 1000V...
  • Page 113 Indoor address repeated failure...
  • Page 114 Central controller display YCZ-A004 HCM-05 BMS display Indoor address repeated failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 9 times...
  • Page 115 Troubleshooting items Address dip switch setting wrong...
  • Page 116 SW03 setting method of 0151800113 PCB Auto setting or wired controller setting (default) Address setting SW03-1 type Dip switch setting Comunication Central control address address 0#(default) 0#(default) Communication address and central control SW03-2~ address by dip SW03~8 switch 127#...
  • Page 117 Check if the dip switch position is right? Resetting Middle position Position is wrong!
  • Page 118 Indoor EEPROM failure...
  • Page 119 Central controller display YCZ-A004 HCM-05 BMS display Indoor EEPROM failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 5 times...
  • Page 120 Troubleshooting items Is it in good condition? 1. Check the EEPROM Fixed well 2. Check PCB...
  • Page 121 Check if the EEPROM is fixed well Reconnect EEPROM Note: the direction of the gap...
  • Page 122 Replace the EEPROM, if it OK Replace the indoor PCB...
  • Page 123 Indoor float switch failure...
  • Page 124 Central controller display YCZ-A004 HCM-05 BMS display Indoor float switch failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 8 times...
  • Page 125 Troubleshooting items 1. Check the indoor float switch 2. Check the drain pan 3. Check the PCB CN4 output 4. Check the water pump bracket...
  • Page 126 Check if the indoor has a float switch Make the CN13 short circuit Short circuit CN13...
  • Page 127 Check if there is water in the drain pan Replace the float switch...
  • Page 128 Check if there isAC 220V output for the CN4 terminal of the indoor PCB Replace the indoor PCB AC 220V...
  • Page 129 Check if the drain pump working normally Replace the drain pump When the pump is running normally, it will vibrate and heat, can make basic judgments by hand...
  • Page 131 Indoor temperature sensor failure...
  • Page 132 Indoor Indication on Central controller display BMS display PCB LED wired controller (hex) YCZ-A004 HCM-05 HCM-01A Indoor ambient temp. sensor TA failure Flash 1 times YR-E17 Indoor coil pipe temp. sensor TC1 failure Flash 2 times YR-E17 Indoor coil pipe temp.
  • Page 133 Troubleshooting items 1. Check the sensor position 2. Check if the sensor resistance 3. PCB setting...
  • Page 134 Check if the sensor position is right and it connects well Reconnect PCB code: 0151800113...
  • Page 135 Check if the sensor resistance is correct? Replace the sensor Contrast sensor characteristics table If all above are no problem, replace the PCB...
  • Page 136 Sensor characteristics table R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 145.82 135.02 7.00 124.22 7.00 138.07 129.13 6.93 120.18 6.93 131.79 123.34 6.85 114.89 6.85 125.67 117.68 6.78 6.78 109.70 119.71 112.18 104.65 6.71 6.71 113.93 106.84 99.75...
  • Page 137 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 3.87 17.18 16.54 15.90 3.87 16.44 15.83 15.23 3.80 3.80 3.73 15.73 15.17 14.60 3.73 15.06 14.53 14.00 3.65 3.65 3.58 14.42 13.93 13.43 3.58 13.82 13.35 3.51 3.51 12.88 3.44...
  • Page 138 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 3.08 4.94 3.23 2.93 4.94 3.12 2.97 2.83 5.00 5.00 3.02 2.87 2.73 5.06 5.06 2.91 2.77 2.63 5.13 5.13 2.82 2.68 2.54 5.19 5.19 2.72 2.59 2.45 5.25 5.25 2.63...
  • Page 139 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 0.87 0.81 7.63 0.75 7.63 0.84 0.78 0.72 7.69 7.69 0.82 0.76 7.75 0.70 7.75 0.80 0.74 7.81 0.68 7.81 0.77 0.72 0.66 7.88 7.88 0.75 0.69 7.94 0.64 7.94 0.73...
  • Page 140 Check if the J8 is disconnected Re-weld Note: only be used for TW failure PCB:0151800113 Re-weld...
  • Page 141 Indoor unit 50Hz Zero-crossing failure...
  • Page 142 Central controller display YCZ-A004 HCM-05 BMS display Indoor unit 50Hz Zero-crossing failure HCM-01A Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 12 times...
  • Page 143 Troubleshooting items 1. Check the power supply 2. Check the wire connection of the power supply of indoor units 3. Check the indoor PCB...
  • Page 145 Check if the wires connection of indoor power supply is right Adjust the wire connection In order to prevent the power supply 3-phase unbalance, the indoor units needs to adopt the same power phase sequence...
  • Page 146 Check if all indoor units report this fault Replace the Replace the PCB of the indoor unit that reported the fault...
  • Page 147 Power module communication failure...
  • Page 148 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Power module communication failure Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 20 times...
  • Page 149 Troubleshooting items Connection position 1. Check the wiring connection Connection status 2. Check the power module...
  • Page 150 Check if the wire connection of outdoor PCB- power module- power module is correct, and the wire is good Reconnect or replace bad wires Outdoor PCB Power module Power module Outdoor PCB Power module Power module...
  • Page 151 Check if the power module is bad Replace the power module Checking the power module refer to "power module inspection"...
  • Page 152 Power module hardware overcurrent...
  • Page 153 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Power module hardware overcurrent Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 20 times...
  • Page 154 Troubleshooting items 1. Check the power supply voltage Connection position 2. Check the wiring connection Connection status 3. Check the system load 4. Check the system refrigerant quantity 5. Check the power module 5. Check the power module 6. Check the compressor 7.
  • Page 155 Check if the power supply voltage is normal Adjust power supply Measuring the power supply Measuring the power supply voltage between L1 and L2 voltage between L1 and L3 Measuring the power supply voltage between L2 and L3 TIPS: For MRV5 380V outdoor units, the power supply voltage between L1/L2/L3 is AC 380V±10%...
  • Page 156 Check if the wire connection between the outdoor PCB - power module - compressor is correct Reconnect or replace bad wires Outdoor PCB Power module Power module...
  • Page 157 If this failure occurs during startup Check the compressor Shake Abnormal noises If replace the power module is If the compressor occurs shake or abnormal not OK, replace the compressor noises phenomenon, replace the power module...
  • Page 158 If this failure occurs during operation Check system problems 2. if the refrigerant charge is normal (can be 1. Check the system load judged by checking whether the system pressure is normal) The system pressure standard Series Mode (Mpa) (Mpa) 18~27 1.5~2.4 0.4~0.85...
  • Page 159 3. Check if the system is dirty Clean the system...
  • Page 160 Compressor out of control...
  • Page 161 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Compressor out of control Digital tube indication on master unit Indication on wired controller (hex) Indoor PCB LED...
  • Page 162 Troubleshooting items The resistance between UVW 1. Check the compressor The resistance between UVW and ground 2. Check the power module 3. Check the system load 4. Check the refrigerent quantity...
  • Page 163 If the compressor can't start, and only has electromagnetic sound？ Replace the power module Note: after replace the module, check the wiring connection according to the wiring diagram. Fan1 Red terminal Communication Communication line 15 V CN16 Fuse line FAN1 T5.0A-250VAC 540V 540V...
  • Page 164 If the compressor can start, but has a friction or a squeaky sound Replace the compressor...
  • Page 165 If the fault occurs during the compressor is running at high frequency （105Hz） Check system load and refrigerant charge System load: 50%≤（total indoor capacity / total outdoor capacity）≤130% Standard: Series Mode Pd(Mpa) Ps(Mpa) 18~27 1.5~2.4 0.4~0.85 Cooling 28~35 1.7~3.2 0.5~0.9 Above 35 2.0~2.9 0.7~1.05...
  • Page 166 If the fault occurs during the compressor is running at low frequency Replace the compressor...
  • Page 167 4-way valve reversing failure...
  • Page 168 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A 4-way valve reversing failure Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED Flash 20 times...
  • Page 169 Troubleshooting items Connection position 1. Check the communication wire Connection status 2. Check the output of PCB terminal 3. Check the 4-way valve 4. Check the system pressure difference 5. Check the high / low pressure sensor...
  • Page 170 Check if the connection between the four-way valve and the PCB is good. Reconnection...
  • Page 171 Check if the 4-way stop valve coil is fixed well Reconnect the coil...
  • Page 172 Check if CN11 of outdoor PCB has 220V output Replace the outdoor PCB...
  • Page 173 Power again，feel the 4-way valve temperature, check if the temperature as below photo Replace the 4-way valve TIPS: Check method： Power again, in cooling mode, touch the 4 pipes of the 4-way valve by hand, if the pipe temperature feels as shown, the 4-way valve is normal;...
  • Page 174 Check if the high and low pressure difference is more than 0.6Mpa Check if the system lacks refrigerant, if yes, recharge the refrigerant The judging method for the system lack of refrigerant (1) Check the static balance pressure value of the system, whether it is the same as the table.
  • Page 175 Check if the high and low pressure sensors are normal Replace the high / low pressure sensor Compare the values of pressure gauges and pressure sensors to judge if the pressure sensor is accurate...
  • Page 176 Static balance pressure Outdoor ambient temp. (°C) Pressure (Mpa) Outdoor ambient temp. (°C) Pressure (Mpa) 0.258 1.198 0.272 1.235 0.287 1.273 0.301 1.312 0.317 1.352 0.332 1.392 0.349 1.433 0.365 1.475 0.383 1.518 1.562 0.419 1.607 0.437 1.653 0.456 1.699 0.476 1.747 0.496...
  • Page 177 Know the 4-way valve，check if the 4-way valve can be reversed Replace the 4-way valve.
  • Page 179 Central controller display YCZ-A004 HCM-05 BMS display HCM-01A Communication failure between indoor unit and outdoor unit. Digital tube indication on master unit Indication on wired controller (hex) YR-E17 Indoor PCB LED 5 Flash 6 times...
  • Page 180 Troubleshooting items Communication wire standard 1. Check the communication wire Communication wire connection method Communication wire short circuit 2. Check the power supply Wired controller group control address (sw01) 3. Check the indoor dip switch setting Communication address between indoor and outdoor (sw03) 4.
  • Page 181 Standard: 1. The communication wire is a double core* (0.75-2)mm2 shielded wire， no polarity. 2.The shield layer of outdoor unit is grounded, or the shied layer of the farthest indoor unit is grounded; 3.The shield layer between each indoor unit must be connected together;...
  • Page 182 通讯线的连接方法是否正确 Reconnect recommend P--Q Q--P Not recommend Hand by hand hand by hand...
  • Page 183 Indoor Buzzer class Indoor Indoor...
  • Page 184 Air switch Not recommended...
  • Page 185 Adjust the indoor address(Refer to MRV indoor service manual) SWO3 SWO3 Different SWO3 SWO3 Same...
  • Page 186 2. Shield the interference 1. Remove interference sources 100Ω Adapter 100μF 100μF Connect the adapter to the PQ of the outdoor unit and the last indoor unit...
  • Page 187 Find the faulty indoor and replace the PCB Method 1: Use the monitoring software...
  • Page 188 Method 2: Check the indoor PCB LED lamp 1. Malfunction lamp LED5 (for console unit is LED1), This lamp not light under normal condition; once indoor unit occurs malfunction this lamp will flicker, flicker times indicate the corresponding failure code. 2.
  • Page 189 Method3. Only connect indoor1- indoor4, if OK,means indoor1- indoor4 OK Only connect indoor1- indoor6, if OK, means indoor1- indoor6 OK Only connect indoor1- indoor7, alarm, means there is a problem with indoor7 Note: for above operation, each time you need to re-power and then search quantity of and lock the indoor units Check and connect the "faulty"...
  • Page 190 Adjust the group control address(refer to MRV indoor service manual) SWO1 SWO1 SWO1 Different SWO1 SWO1 SWO1 Same...
  • Page 191 Temperature sensor failure...
  • Page 192 Troubleshooting items 1. Check sensor position and connection 2. If the sensor resistance is correct 3. If the PCB is good...
  • Page 193 Digital tube Indication on Digital tube Indication on Fault definition Fault definition indication on wired controller indication on wired controller master unit (hex) master unit (hex) Oil temp. Defrosting temp. sensor Th failure sensor Tdef failure YR-E17 YR-E17 Oil temp. Ambient temp.
  • Page 194 Check if the sensor position is right and connect well Reconnect Connection position Sensor code Sensor name Characteristic 0150401911 Toci1/Tsacc sensor R25=10KΩ 0150401913 Tdef sensor R25=10KΩ 0150401910 Tao sensor R25=10KΩ 0150401914 Td1 sensor R80=50KΩ 0150401916 Toil1 sensor R80=50KΩ 0150401915 Td2 sensor R80=50KΩ...
  • Page 195 Check if the sensor resistance is correct? Replace the sensor 20MΩ Contrast sensor characteristics table If all above are no problem, replace the PCB...
  • Page 196 Sensor characteristics table R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 145.82 135.02 7.00 124.22 7.00 138.07 129.13 6.93 120.18 6.93 131.79 123.34 6.85 114.89 6.85 125.67 117.68 6.78 109.70 6.78 119.71 112.18 6.71 6.71 104.65 113.93 106.84 6.64...
  • Page 197 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 3.87 17.18 16.54 15.90 3.87 15.83 3.80 3.80 16.44 15.23 3.73 15.73 15.17 14.60 3.73 3.65 15.06 14.53 14.00 3.65 14.42 13.93 13.43 3.58 3.58 3.51 13.82 13.35 12.88 3.51 12.80...
  • Page 198 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 3.23 3.08 2.93 4.94 4.94 3.12 2.97 2.83 5.00 5.00 3.02 2.87 2.73 5.06 5.06 2.77 5.13 2.91 2.63 5.13 2.82 2.68 2.54 5.19 5.19 2.72 2.59 2.45 5.25 5.25 2.63...
  • Page 199 R25=10KΩ±3% B25/50=3700K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 0.87 0.81 0.75 7.63 7.63 7.69 0.84 0.78 0.72 7.69 0.82 0.76 7.75 0.70 7.75 0.80 0.74 0.68 7.81 7.81 0.77 0.72 7.88 0.66 7.88 0.75 0.69 7.94 0.64 7.94 0.73...
  • Page 200 R80=50KΩ±3% B25/80=4450K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 1749.01 1921.99 2094.97 9.00 9.00 1813.27 8.93 1651.43 1975.10 8.93 1560.17 1711.65 1863.13 8.85 8.85 1474.74 1616.59 1758.45 8.78 8.78 1394.71 1527.61 8.70 8.70 1660.51 1319.68 1444.25 1568.82 8.63 8.63 1366.10...
  • Page 201 R80=50KΩ±3% B25/80=4450K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 209.01 221.82 234.63 5.78 5.78 212.25 200.15 224.35 5.70 5.70 191.72 203.14 214.57 5.63 5.63 183.67 194.47 205.26 5.55 5.55 186.20 176.01 196.40 5.48 5.48 168.70 178.33 187.96 5.40 5.40 161.74...
  • Page 202 R80=50KΩ±3% B25/80=4450K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 38.89 40.26 3.40 3.40 41.63 3.47 37.51 38.86 40.20 3.47 3.53 36.18 37.51 38.83 3.53 36.21 3.60 34.91 37.51 3.60 33.68 34.96 3.67 3.67 36.24 3.73 32.50 33.76 35.03 3.73 3.80...
  • Page 203 R80=50KΩ±3% B25/80=4450K±3% Temp resistance（KΩ） % (resist.tol) Rmax R（t）Normal Rmin MAX(+) MIN(-) （℃） 6.27 9.36 9.99 10.61 6.27 9.09 9.70 6.33 10.32 6.33 8.82 9.43 10.03 6.40 6.40 6.47 8.57 9.16 9.75 6.47 8.32 8.90 6.53 9.48 6.53 8.08 8.65 9.22 6.60 6.60 6.67...
  • Page 204 The compressor startup failure...
  • Page 205 Troubleshooting items 1. Check the resistance of compressor 2. Check the power module 3. Replace the compressor...
  • Page 206 通讯线的连接方法是否正确 Replace the compressor Measure the resistance between U and W Measure the resistance between V and W Compressor Compressor Model code resistance 0.23Ω (20̊ C ) 0150710574A AV16/26IMVEVA 0.23Ω (20̊ C ) AV08/10/12/14/22/24IMVEVA 0150710572 0.31Ω (20̊ C ) 0150710570 AV20IMVEVA 0.16Ω...
  • Page 207 通讯线的连接方法是否正确 Replace the compressor Measure the resistance between W and ground Measure the resistance between U and ground Measure the resistance between V and ground...
  • Page 208 Replace the power module to see if it starts. Replace the compressor Replace the power module, if not ok, replace the compressor...
  • Page 209 Part inspection MRV 5 outdoor fan motor inspection........................207 MRV 5 power module inspection...........................210...
  • Page 210 Fan motor inspection...
  • Page 211 The motor is bad...
  • Page 212 Power off, testing the motor terminals It is short circuit between It is short circuit between red line and white line orange line and brown line It is short circuit between It is open circuit between yellow line and blue line white line and brown line...
  • Page 213 Power module inspection...
  • Page 214 CN22 CN24 CN21 LED1 LED2 1. R/S/T: 3-phase AC power inputs 2. U/V/W is connected to the compressor terminal (output terminal) 3. CN21: DC fan motor power supply terminal (DC 15V) 4. CN22: Communication terminal (5VDC voltage), for single compressor model, CN22 is connected to the outdoor PCB;...
  • Page 215 Check the appearance of the power module Step1: Power on, see the LED 2 and LED3...
  • Page 216 Power off 5 min Step2: measure...
  • Page 217 The resistance value P and U: 1.62MΩ P and V: 1.62MΩ P and W: 1.62MΩ Measure the voltage value of CN21,CN22 and CN24 DC 20V The resistance value Test point N and U:2.45MΩ CN21:DC15V N and V: 2.45MΩ CN22:DC5V N and W: 2.45MΩ CN24:DC5V...

This manual is also suitable for:

R32 series3u55s2sr2fa3u70s2sr2fa4u75s2sr2fa4u85s2sr2fa

Table of Contents