110
Failure code
Outdoor
digital
display tube:
40
Indoor wired
controller:
28
Indoor unit LED status
LED5 Failure description:
High pressure sensor Pd too high protec-
tion
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 high pressure
acquired by the PCB is
correct ;
◆
Check if the voltage
characteristic corresponding
to the pressure sensor is
correct ;
◆
Check if the high pressure
side of the system is blocked ;
◆
Check the outdoor fan
for normal operation when
cooling.
conditions
The high pressure switch is
turned off for 2s.
4. Possible causes
◆
The pressure sensor is
broken;
◆
The pressure sensor signal
acquired by the PCB is incorrect;
◆
The high pressure side of the
unit is blocked;
◆
The outdoor fan stops
operating when cooling;
◆
The refrigerant is excessive;
◆
It is out of the operating range
of units.
Check if the voltage c haracteristic o f the
corresponding pressure sensor is normal.
Check if the pressure s ensor
signal a cquisition l oop of the
computer board is normal.
Check i f the high pressure reaches
4.0MPa upon failure alarm.
Check i f the high p ressure stop
valve is t urned o n or t he h igh
pressure side is blocked.
Check t he outdoor f an f or norma l
operation when cooling.
Check if the refrigerant is excessive.
Check i f the allowed operatio n
range is exceeded
Replace it correctly b y after-
sales personnel on site.
Replace it correctly b y after-
sales personnel on site.
Rectify i t correctly b y after-sale s
personnel on site.
Rectify it c orrectly b y after-sales
personnel on site.
Notify the user to use it within the
operating range o f units b y after-
sales personnel.
Y
N
Y
Y
Y
N
N
Y
Y
N
Y
Rectify it c orrectly b y after-sale s
personnel on site.
including the noncondensable gas
N
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