Haier HSU-09HSA03/R2(DB) Indoor Display E14, Method of, Malfunction, Detection, Decision, Causes

HSU-09/12HR03/R2(DB) Service diagnosis

7.3.2Indoor fan motor malfunction

Indoor Display E14

Method of	The rotation speed detected by the Hall IC during fan motor operation is used to
Malfunction	determine abnormal fan motor operation
Detection
Malfunction	when the detected rotation feedback singal don’t receiced in 2 minutes
Decision
Conditions
Supposed	Operation halt due to breaking of wire inside the fan motor .
Causes	Operation halt due to breaking of the fan motor lead wires
	Detection error due to faulty indoor unit PCB

whether terminal CN13	NO
and CN7 on indoor PCB
well inserted or not?

YES

Electrify the machine again and turn it on in the cooling operation, Measure voltage between the positions 1 ( blue wire) and 3( yellow wire) of Terminal CN13 on the indoor PCB

Pull out and reinsert the terminals

NO

the voltage is about 90-200vac

Yes

NO

check whether motor can run when turn on the unit

the indoor pcb is damaged and need replace

When motor is running Measure whether there is voltage pulse(12VDC) between the positions 1(middle wire) and 4( black wire) of Terminal CN7 on the indoor PCB

Yes

the indoor motor is damaged and need replace

is nomal or not?

YES

NO

the indoor motor is damaged and need replace

the indoor pcb is damaged and need replace

52

Domestic air conditioner5