Haier MRV 5-RC VP1-112B Service Manual page 216

Failure code
Outdoor Indoor unit LED status
digital
display tube:
117- 4, 5
Indoor wired
Outdoor unit LED status
controller:
75
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the fan motor
strong electricity wire is
insecurely connected;
◆ Fan rotation is smooth
◆ Check if the module is
normal, if short circuit
3. Abnormity confirmation
conditions
Double fan: fan running current
value over 5.5A, single fan: fan
running current value over 6A
4. Possible causes
◆ Fan motor is poor
◆ Fan blade overload
Normal
Failure diagnosis and troubleshooting
Diagnosis
Check if the supply voltage is normal.
Check if the electrical
cabinet is wired correctly,
the variable frequency
board and module board
is connected securely.
Motor rotation is smooth, the sound
is normal
Running current value is normal
Replace and compare the
neighboring electrical cabinet
by exclusion method
LED5 Failure description:
Fan motor module software over current
20 times
LED1 LED2
Normal
N
Y
N
Y
N
Y
N
Y
213
Troubleshooting
Adjust the supply voltage.
Readjust wiring and fixing method in
accordance with the circuit diagram.
Replace the fan motor
Replace the fan motor