Haier MRV 5-RC VP1-112B Service Manual page 207

Failure code
Outdoor Indoor unit LED status
digital
display tube:
110-1, 2
Indoor wired
Outdoor unit LED status
controller:
6E
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the modules are in
normal conditions and if P and
N are short-circuited to U, V
and W.
◆ Check if the modules are
fixed securely and the heat
dissipation is good;
◆ Check if the compressor
resistance is normal,
◆ Check if the compressor
wiring UVW is wrongly
connected and if the inverter
board and module board are
wired securely.
3. Abnormity confirmation
conditions
Over current of module
hardware
4. Possible causes
◆ The module alarms FO
failure due to poor heat
dissipation;
◆ The module alarms failure
as it is broken down;
◆ Liquid shock is found in
compressor, which results in
over current upon starting or
operating;
◆ The winding resistance of
compressor is large;
◆ 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 and
compressor wires are secured, the
UVW is correctly connected and
the variable frequency board and
module board are wired correctly.
Check if the power module is normal
Check if there is other failure,
112, and 114
Check if the compressor, resistance
and insulation are normal
Troubleshoot each failure.
LED5 Failure description:
Compressor module hardware over current
20 times
LED1 LED2
Normal
N
Y
N
Y
N
Y
N
Y
N
Y
204
Troubleshooting
R e c t i f y o n s i t e b y a f t e r - s a l e s
personnel.
R e c t i f y o n s i t e b y a f t e r - s a l e s
personnel.
Replace on site by after-sales
personnel.
Replace the compressor.
Detect by exclusion.