Haier MRV 5-RC VP1-112B Service Manual page 225

Failure code
Outdoor Indoor unit LED status
digital
display tube:
125-4, 5
Indoor wired
Outdoor unit LED status
controller:
7D
1. Model
MRV 5-RC series
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
Normal
Failure diagnosis and troubleshooting
Diagnosis
Whether the power supply voltage is
too low or fluctuating significantly
Y
Check if the electrical box connect
correctly
Check if the inverter module is
normal
Exchange the left and the right
fan motor, if the failure fan motor
is OK
LED5 Failure description:
Fan motor speed un-match
20 times
LED1 LED2
Normal
N
N
Y
N
Y
N
222
Troubleshooting
Adjust the power supply.
Reconnect or re-fix it in
accordance with wiring
diagram.
Replace the inverter module
Replace fan motor