109
Failure code
Outdoor
digital
display tube:
39-1
Indoor wired
controller:
27
Indoor unit LED status
LED5 Failure description:
Compressor ratio
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 operating
compression ratio of system is
above 8 before failure alarm;
◆
Check if the unit lack of
refrigerant.
◆
Check if the pipelines on the
low pressure side or liquid side
are blocked;
◆
Check if the detection value
of high/low pressure sensor is
correct.
◆
Check if the unit is beyond
the operation range.
conditions
Alarm to shut down if the
detected for continuous 5min
after the compressor operates;
alarm to shut down if the
for 1min separately.
4. Possible causes
◆
The detection value of high/
low pressure sensor is incorrect;
◆
The refrigerant in the system
with air leakage;
◆
The pipelines on the high
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 if the system operating
compression ratio is above 8
before failure alarm.
Check if the refrigerant in the system
Check if the detection value of high-
low 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.
Use the unit in accordance with
its allowed operation range.
Rectify i t correctly b y after-sales
personnel on site.
Troubleshoot and rectify it correctly
by after-sales personnel on site.
[Note]: Simultaneously, check if all
stop valves can be turned on.
Check i f all the electronic
expansion valves of the indoor unit
can be turned on normally.
Y
Y
Y
N
N
Y
N
Y
N
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