108
Failure code
Outdoor
digital
display tube:
39-0
Indoor wired
controller:
27
Indoor unit LED status
LED5 Failure description:
Low pressure sensor Ps too low protection
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the low pressure of
system is below 0.06MPa before
failure alarm;
◆
Check if the unit lack of
refrigerant.
◆
Check if the pipelines on the
low pressure side or liquid side
of the unit are blocked;
◆
Check if the detection value
of low pressure sensor is correct.
◆
Check if the unit is beyond
the operation range.
conditions
Alarm to shut down if the
followings are detected for
5min: cooling: Ps< 0.10Mpa;
heating: Ps< 0.05Mpa; oil
return: Ps<0.03Mpa after the
compressor operates. (except
residual operation)
4. Possible causes
◆
The detection value of low
pressure sensor is incorrect;
◆
The refrigerant in the system
with air leakage;
◆
The pipelines on the low
pressure side or liquid side of
the unit are blocked;
◆
The outdoor unit cannot be
turned on normally due to failure
to open electronic expansion of
outdoor heat exchanger when
heating;
◆
The operation environment is
beyond the allowed range.
Check i f the low pressur e
of system is below 0.05MPa
before failure alarm;
Check if the refrigerant in the system
Check if the detection value of l ow
pressure sensor is correct.
Check i f the pipelines o n the
low pressure s ide or liqui d
side of the unit are blocked.
Check i f the allowed operatio n
range is exceeded.
Use the unit in accordance with
its allowed operation range.
Replace it correctly b y after-
sales personnel o n site a nd
ensure the refrigerant is enough.
Rectify it correctly b y after-sale s
personnel on site.
Troubleshoot and rectify it correctly
by after-sales personnel on site.
[Note]: Check if all stop valves can
be turned on and if the air-returning
Check if all the electronic
expansion valves of the indoor unit
can be turned on normally.
Y
Y
Y
N
N
N
Y
Y
N
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