Haier MRV 5-RC VP1-112B Service Manual page 180

FFailure
code Indoor unit LED status
Outdoor
digital
display tube:
23-0,1
Indoor wired Outdoor unit LED status
controller:
17
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Check if the sensor
connection is normal;
◆ Check if resistance
characteristic of the sensor is
normal;
◆ Check if the temperature
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
60 seconds continuously. If
Ta≤-10°C the open circuit is
detected after 3 minutes of
compressor operation (AD
value is below 11).
4. Possible causes
◆ The connection of sensor is
not secure;
◆ The sensor is broken;
◆ The sensor is with
resistance drift;
◆ The temperature 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 r e s i s t a n c e
characteristic of the sensor
is normal
Check if the temperature
l o o p a c q u i r e d b y t h e
computer board is normal
LED5 Failure description:
Discharging temperature sensor:
20 times Td1and Td2 failure
LED1 LED2
Normal
N
Y
N
Y
Y
177
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.