Haier H2SM-(9+12)HEK03/R2 Service Manual page 56

7.4.5 Outdoor unit A or B's coin sensor failure
Outdoor Display
Method of Malfunction
Detection
Malfunction Decision
Conditions
Supposed Causes
* Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may
be occurred.
Thermistor resistance check method:
Remove the connectors of the thermistors on the PCB, and measure the resistance of thermistors using
tester.The relationship between normal temperature and resistance is shown in the value of outdoor
thermistor.
H2SM-(9+12)HEK03/R2
This type of error is detected by checking the thermistor input voltage to the
microcomputer.(A thermistor error is detected by checking the temperature)
The thermistor input is above 4.9V or below 0.1V with the power on.
* Note: The values may vary slightly in some models
Faulty connector connection
Faulty thermistor
Faulty PCB
Check the connector connection.
Is it normal?
YES
Thermistor resistance
Is it normal?
YES
Correct the connection
NO
Replace the thermistor
NO
Replace the outdoor unit PCB
54
Service Diagnosis
Domestic Air Conditioner