Haier MRV 5-RC VP1-112B Service Manual page 186

Failure code
Outdoor Indoor unit LED status
digital
display tube:
29
Indoor wired
Outdoor unit LED status
controller:
1D
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the sensor
connection is normal;
◆ Check if voltage
characteristic of the sensor is
normal;
◆ Check if the pressure loop
acquired by the PCB is normal.
3. Abnormity confirmation
conditions
It is detected that the AD value
is below 11 (open circuit) or
above 1012 (short circuit)
for 30 seconds continuously,
and no alarm is given during
defrosting and within 3 minutes
at the end of defrosting.
4. Possible causes
◆ The connection of pressure
sensor is not secure;
◆ The pressure sensor is
broken;
◆ The pressure acquired by
PCB is not accurate.
Normal
Failure diagnosis and troubleshooting
Diagnosis
Check if the corresponding
connector of sensor is normal
C h e c k i f t h e v o l t a g e
characteristic of the sensor
is normal
Check if the pressure loop
acquired by the computer
board is normal
LED5 Failure description:
Low pressure sensor Ps failure
20 times
LED1 LED2
Normal
N
Y
N
Y
N
183
Troubleshooting
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.