222
Failure code
Outdoor
digital
display tube:
125-4, 5
Indoor wired
controller:
7D
Indoor unit LED status
LED5
Failure description:
Fan motor speed un-match
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 compressor
module is damaged
◆
Check if the fan rotation is
smooth;
◆
Check whether the fan
blade load is blocked;
3. Abnormity confirmation
conditions
Hall signal logic built-in the fan
motor is wrong too many times
4. Possible causes
◆
Fan blade overload
◆
Fan motor is bad
Y
Whether the power supply voltage is
too low or fluctuating significantly
N
Adjust the power supply.
Y
Check if the electrical box connect
correctly
Reconnect or re-fix it in
accordance with wiring
diagram.
N
Check if the inverter module is
normal
N
Replace the inverter module
Y
Exchange the left and the right
fan motor, if the failure fan motor
is OK
N
Replace fan motor
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 ...