99
Failure code
Outdoor
digital
display tube:
27-0, 1
Indoor wired
controller:
1B
Indoor unit LED status
LED5 Failure description:
Outdoor compressor oil temperature too
high failure(Toil1 and Toil2)
20 times
Outdoor unit LED status
LED1L ED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the temperature
detected by the oil temperature
sensor is correct;
◆
Check the unit for leakage
◆
Check if the outdoor unit
SV31, SV32, LEVb, etc. can be
normally turned on;
◆
Check the outdoor heat
blockage and inlet & outlet air
blockage.
◆
Check the indoor heat
blockage and inlet & outlet air
blockage when cooling.
conditions
4. Possible causes
◆
The oil temperature sensor
is with resistance drift;
◆
The refrigerant in the system
◆
The outdoor unit LEVb,
SV31, SV32, etc. cannot be
turned on normally;
◆
The unit condensation
side is with poor heat transfer
function.
◆
The operation environment
is beyond the allowed range.
Replace the oil temperatur e
sensor by after-sales personnel
on site.
Check i f the resistance o f oil
temperature sensor is correct
Check if the refrigerant in the
Check if the outdoor heat
exchange is normal when cooling,
and check if the indoor
heating is normal when heating
Check if the outdoor unit LEVb, SV31
and SV32 can be turned on normally
Check i f it i s beyond t he
allowed operation range of unit.
Use the unit in accordance
with its allowed range.
Replace it correctly by after-
sales p ersonnel o n site a nd
ensure refrigerant is enough.
Replace it correctly by after-
sales personnel on site.
Troubleshoot a nd r eplace
it correctly b y after-sales
personnel on site.
N
Y
N
Y
Y
Y
Y
N
N
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