102
Failure code
Outdoor
digital
display tube:
30-0, 1
Indoor wired
controller:
1E
Indoor unit LED status
LED5 Failure description:
High pressure switch HPS1 and HPS2 fail-
ure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the pressure switch
connection is normal;
◆
Check if the pressure switch
signal loop acquired by the
PCB is normal;
◆
Check if the pressure switch
is turned off usually and the
pressure exceeds 4.0MPa
when disconnection;
◆
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 connection of pressure
switch is not secure;
◆
Pressure switch is broken;
◆
The pressure switch
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.
Replace it c orrectly by after-
sales personnel on site.
Check if the corresponding connector
of pressure switch is normal
Check if the pressure switch
signal loop acquired by the
computer board is normal
Check if the high pressure reaches 4.0MPa
when the pressure switch is turned off
Check if t he high pressure s top
valve is t urned o n or t he h igh
pressure side is blocked
Check if it is out of the operating range of units.
Check t he o utdoor f an f or
normal operation when cooling
Check if the refrigerant is excessive
Replace it c orrectly by after-
sales personnel on site.
Rectify it c orrectly b y after-
sales personnel on site.
Rectify it c orrectly b y after-
sales personnel on site.
Rectify it correctly by after-sales
personnel on site.
gases enter the system.
Notify the user to use it within the
operating r ange of units by after-
sales personnel.
N
N
N
Y
Y
Y
Y
Y
N
N
Y
Y
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