Haier AS71S2SF1FA-BC Service Manual page 41

10.3.11 Loss of synchronism detection
Inverter side current detection is abnormal
Outdoor Display LED1 flash 18 times
LED1 flash 19 times
Method of The position of the compressor rotor can not detected normally
Malfunction
Detection
Malfunction when the wiring of compressor is wrong or the connection is poor;
Decision or the compressor is damaged
Conditions
Supposed ■ Faulty The wiring of compressor
Causes ■ Faulty compressor
■ Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or parts
Within 3 minutes after the machine is
supplied with power and turned on with
the remote controller, 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
damage may be occurred.
YES
38
NO
1. The wiring of compressor is incorrect
or the connection is poor;
2. The compressor is damaged
YES
IPM Module is damaged and needs
replacing.
Malfunction unsolved
the Malfunctions
compressor is damaged replace a
new one
Installations
exist also, the
Domestic air conditioner