217
Failure code
Outdoor
digital display
tube:
120-1, 2
121-1, 2
Indoor wired
controller: 78,
79
Indoor unit LED status
LED5
Failure description:
Compressor module power supply abnor-
mal
20 times
Outdoor unit LED status
LED1
LED2
Normal
Normal
1. Model
Failure diagnosis and troubleshooting
MRV 5-RC series
Diagnosis
Troubleshooting
2. Abnormity detection method
◆
Check if the supply voltage
is abnormal.
◆
Check if the PTC or relay
contacts or not.
◆
Check if the DC bus voltage
is normal.
◆
Check if the DC power
supply of inverter board is
normal.
3. Abnormity confirmation
conditions
The power supply of inverter
control board is interrupted
instantly.
4. Possible causes
◆
The supply voltage is found
with abnormal fluctuations.
◆
The PTC or relay does not
contact.
◆
The inverter control board is
in poor performance.
Check if the supply voltage is normal
Check if the electrical
cabinet is correctly
connected
Check if the PTC or relay is contacted .
Check if the voltage between P
and N is less than 375V.
Check the rectifier bridge,
electrolytic capacitor, electric
reactor in variable frequency
loop.
Reconnect or re-fix it in
accordance with circuit
diagram.
Adjust or replace PTC or relay.
The DC bus voltage of variable
frequency board is abnormal,
replace the board.
Adjust the power supply.
Y
Y
Y
Y
N
N
N
N
Summary of Contents for MRV 5-RC AB052MAERA
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...