Haier MRV 5-RC VP1-112B Service Manual page 224

Failure code
Outdoor Indoor unit LED status
digital
display tube:
125-0, 1
Indoor wired
Outdoor unit LED status
controller:
7D
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the communication
circuits of power module and
inverter board are securely
inserted and connected.
◆ Check if the power module
is well.
◆ Check if the inverter board
is well.
3. Abnormity confirmation
conditions
(current frequency ≥ INV
target frequency +3Hz) or
(target frequency ≥0 && actual
frequency =0) for continuous 5
minutes
4. Possible causes
◆ The power module and
inverter board are connected
loosely, which results in
detection failure of compressor
rotation speed.
◆ The power module is
damaged.
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
Compressor winding resistance,
insulation is normal
LED5 Failure description:
Compressor frequency un-match
20 times
LED1 LED2
Normal
N
N
Y
N
Y
N
221
Troubleshooting
Adjust the power supply.
Reconnect or re-fix it in
accordance with wiring
diagram.
Replace the inverter module
Replace the compressor