Haier MRV 5-RC VP1-112B Service Manual page 190

Failure code
Outdoor Indoor unit LED status
digital
display tube:
34-0, 1
Indoor wired
Outdoor unit LED status
controller:
22
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the temperature
detected via a discharging
temperature sensor is correct.
◆ Check the unit for leakage
or insufficient refrigerant;
◆ Check if the outdoor unit
SV31, SV32, LEVb, etc. can be
normally turned on;
◆ Check the outdoor heat
exchanger of unit for filth
blockage and air inlet & outlet
short circuit when cooling.
◆ Check the indoor heat
exchanger of the unit for filth
blockage and air inlet & outlet
short circuit when heating.
3. Abnormity confirmation
conditions
Toil1/Toil2≥120°C.
4. Possible causes
◆ The oil temperature sensor
is with resistance drift;
◆ The refrigerant in the system
is insufficient;
◆ The outdoor unit LEVb,
SV31 and SV32 cannot be
turned on normally.
◆ The unit condensation
side is with poor heat transfer
function;
◆ The operation environment
is beyond the allowed range.
Normal
Diagnosis and troubleshooting
Diagnosis
Check if the resistance of
discharging temperature
sensor is correct.
Check if the refrigerant in the
system is with leakage or insufficient.
Check if the outdoor heat
exchange is normal when
cooling, and check if the
indoor heat exchange is
normal when heating.
C h e c k i f t h e o u t d o o r u n i t
LEVb, SV31 and SV32 cannot
be turned on normally.
Check if the allowed operation
range is exceeded.
Use the unit in accordance with
its allowed operation range.
LED5 Failure description:
Outdoor compressor discharging tempera-
20 times ture (Td1, Td2).too high failure
LED1 LED2
Normal
N
Y
N
Y
N
Y
N
Y
Y
187
Troubleshooting
Replace the discharging
temperature sensor by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site and
ensure the refrigerant is enough.
Replace it correctly by after-
sales personnel on site.
Troubleshoot and replace
it correctly by after-sales
personnel on site.