Haier H2SM-(9+12)HEK03/R2 - Page 56

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