Haier MRV 5-RC VP1-112B Service Manual page 199

Failure code
Outdoor Indoor unit LED status
digital
display tube:
46-4, 5
Indoor wired
Outdoor unit LED status
controller:
2E
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the communication
wire correspondence of fan
motor is correct;
◆ Check if the communication
wire is disconnected;
◆ Check if the driver module
whitch power supply to the fan
motor is powered
3. Abnormity confirmation
conditions
Fan motor has a host computer
or compressor inverter, no
communication for 30s
4. Possible causes
◆ Poor communication wire:
disconnection;
◆ Incorrect correspondence
of INV1 and INV2; incorrect
connection of outdoor unit
communication port of PCB;
◆ Poor inverter board or
connection board
Normal
Diagnosis and troubleshooting
Diagnosis
Check if the connection of fan
motor communication wire and
compressor module wire is correct
Check if the communication wire
of fan motor is disconnected;
Test if the voltage of the two
central needles of CN28 and
CN57 changes by a multimeter.
Check if the compressor module
connected with the fan motor is
OK
Replace the compressor module
LED5 Failure description:
Communication with fan motor module
20 times
board 1, 2 failure
LED1 LED2
Normal
N
Y
Y
N
N
Y
N
196
Troubleshooting
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.
Replace the interface
board of outdoor unit.