Haier HSU-18HEK03/R2 Service Manual page 36

Whether terminal CN6 on
indoor PCB contact wellt?
YES
Pull the sensor out of the mainboard
1) Measure the value of resistance Between its two
jumpers
2) Measure the temperature at the room temperature
sensing head.
Check the value of the
sensor to see whether the
sensor is damaged or not?
NO
The indoor PCB is broken, replace with new indoor PCB
notes:
E1: Room temperature sensor failure
E2: Indoor heat-exchange sensor failure
The date received from EEPROM is checked whether normal
When the date sent from EEPROM cannot be received normally , or when EEPROM is not
detected
Faulty PCB
Replace the PCB of indoor unit
Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
NO
YES
33
Pull out the terminals on the indoor mainboard and
reinsert them
Correct the connection
Sensor is broken,replace it with new sensor
Domestic Air Conditioner
or