218
Failure code
Outdoor
digital
display tube:
122-1, 2
Indoor wired
controller: 7A
Indoor unit LED status
LED5
Failure description:
Radiator temp. sensor of compressor mo-
dule is abnormal.
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 temperature
acquisition circuit of inverter
board is normal.
◆
Check if the resistance of
temperature sensor is normal.
◆
Check if they are connected
correctly
3. Abnormity confirmation
conditions
The temperature sensor is
disconnected or the resistance
is incorrect.
4. Possible causes
◆
The resistance of
temperature sensor is found
with drift.
◆
The inverter board acquires
inaccurate temperature.
Check if the sensor and
variable frequency board is
connected correctly.
Check if the sensor
resistance is normal.
Replace the variable
frequency board.
Replace the sensor.
Adjust the connection
between temperature sensor
and variable frequency
board.
Y
Y
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 ...