Haier MRV5-H - Page 116

113
Failure code
Outdoor
digital
display tube:
46-0, 1
Indoor wired
controller:
2E
Indoor unit LED status
LED5 Failure description:
Communication with INV1 and INV2 module
board failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
Diagnosis Troubleshooting
2. Abnormity detection method
◆
Check if the communication
wire correspondence of inverter
module is correct;
◆
Check if the communication
wire is disconnected;
conditions
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
Replace it c orrectly by after-
sales personnel on site.
Check i f the interface board is
connected with the wiring harness of
variable frequency board correctly.
Check i f the communication w ire
is disconnected;
Test i f the voltage of t he t wo
central needles o f CN28 a nd
CN57 changes by a multimeter.
Replace it c orrectly by after-
sales personnel on site.
Replace t he i nterface
board of outdoor unit.
N
N
Y
Y
Y