Haier MRV 5-RC VP1-112B Service Manual page 223

Failure code
Outdoor Indoor unit LED status
digital display
tube:
124-1, 2
Indoor wired
Outdoor unit LED status
controller: 78,
7C
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the modules' R, S,
T are correct, if missing phase
◆ Check if the power supply of
the electrical box lack of phase,
if the voltage is too low
3. Abnormity confirmation
conditions
Module three-phase power
failure
4. Possible causes
◆ Module three-phase voltage
is too low
◆ Module three-phase power
lack of phase or imbalance
Normal
Failure diagnosis and troubleshooting
Diagnosis
Check if the power supply voltage
too low or lack of phase
Check if the electrical box connect
correctly
Check if the inverter module connect
well
Check if the inverter module is
normal
Replace the electrical box to
compare
LED5 Failure description:
Compressor module three-phase power
failure
20 times
LED1 LED2
Normal
N
Y
N
Y
N
Y
N
Y
220
Troubleshooting
Adjust the power supply.
Reconnect or re-fix it in
accordance with wiring
diagram.
Reconnect or re-fix it in
accordance with wiring
diagram.
Replace the inverter module