Haier MRV 5-RC AS072MNERA User Manual

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 conrmation
conditions
The power supply of inverter
control board is interrupted
instantly.
4. Possible causes
◆
The supply voltage is found
with abnormal uctuations.
◆
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

Haier MRV 5-RC AS072MNERA Specifications

General

Brand	Haier
Model	MRV 5-RC AS072MNERA
Category	Heat Pump
Language	English