Haier MRV5-H - Page 96

93
Failure code
Outdoor
digital
display tube:
21
Indoor wired
controller:
15
Indoor unit LED status
LED5 Failure description:
Ambient temperature sensor:
Tao failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
Diagnosis Troubleshooting
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.
conditions
It is detected that the AD value
is below 11 (open circuit) or
above 1012 (short circuit)
for 60 seconds continuously,
and no alarm is given during
defrosting and within 3 minutes
at the end of defrosting.
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.
Replace i t correctly by after-
sales personnel on site.
Check i f the correspondin g
connector of sensor is normal
Check if resistance
characteristic of the sensor
is normal
Check if t he t emperature
loop a cquired by t he
computer board is normal
Replace i t correctly by after-
sales personnel on site.
Replace i t correctly by after-
sales personnel on site.
N
N
Y
Y
Y