Haier 1U35KEHFRA-NR Service Manual page 50

10.4.11 Loss of synchronism detection (Compressor position detection circuit fault)
Outdoor Display F11 LED1 flash 18 times
F28 LED1 flash 19 times
Method of
The position of the compressor rotor can't detected normally
Malfunction
Detection
Malfunction
When the wiring of compressor is wrong or the connection is poor;
Decision
Or the compressor is damaged
Conditions
■ Faulty The wiring of compressor
Supposed
Causes
■ Faulty compressor
■ Faulty PCB
Trouble
* Caution:
shooting
or parts damage may be occurred.
Within 3 minutes after the machine is
supplied with power and turned on with
the remote control, check whether the
compressor can start up
At first, the compressor start up, soon
the compressor stopped with the LED1
on the outdoor PCB blinks (1Hz) 19/18
times
Maybe there is some disturbance
Be sure to turn off power switch before connect or disconnect connector,
YES
50
The wiring of compressor is incorrect or
NO
the connection is poor;
The compressor is damaged
YES
IPM module is damaged and
needs replace.
Malfunction unsolved
Malfunctions exist also, the
compressor is damaged replace
a new one
Service Diagnosis