Haier MRV 5-RC VP1-112B Service Manual page 215

Failure code
Outdoor Indoor unit LED status
digital
display tube:
117-1, 2
Indoor wired
Outdoor unit LED status
controller:
75
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the compressor is
insecurely connected;
◆ Check the system for liquid
shock.
◆ Check if the module is in
normal conditions and subject
to short circuit.
◆ Check if the compressor is
well.
◆ Check if the compressor
wiring UVW is connected
correctly and the inverter board
and module board is securely
wired.
3. Abnormity confirmation
conditions
Over current of module software
4. Possible causes
◆ The current detection
loop of inverter board is in
poor performance, which
results in rapid current rise of
compressor;
◆ Damage or liquid shock is
found in compressor, which
results in over current;
◆ UVW wiring is wrongly
connected or the inverter board
and module board are wired
insecurely.
Normal
Failure diagnosis and troubleshooting
Diagnosis
Check if the supply voltage is normal.
Check if the electrical
cabinet is wired correctly,
the compressor matches
U, V and W correctly
and the variable frequency
board and module board
is connected securely.
Check if the power module is normal.
Check if the detection circuit of
variable frequency board is normal.
Check if the winding and insulation
of compressor is normal.
Replace and compare the
neighboring electrical cabinet
by exclusion method
LED5 Failure description:
Compressor module software over current
20 times
LED1 LED2
Normal
N
Y
N
Y
N
Y
N
Y
N
Y
212
Troubleshooting
Adjust the supply voltage.
Readjust wiring and fixing method in
accordance with the circuit diagram.
Replace the power module.
Replace the variable frequency
board.
Replace the compressor.