Haier AD50S2SM1FA - Page 242

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[17] 4-Way Valve Reversing Failure
Reconnect
If connection between 4-way
valve and PCB is good
If coil of 4-way valve
xed well and if its
characteristic is
correct
If system meets
condition of 4-way
valve reversing: Pd-
Ps>0.6Mpa
Measure if CN5 voltage
on PCB is 208/230VAC
after 4-way valve reversing
conditon is met
If there is air noise after 4-way
valve reverses, and if the
temp. of connection pipes
with 4-way valve is
normal
Fix again or replace the sensor
Check if compressor is operation
Replace PCB
Replace 4-way valve
Y
Y
Y
N
Y
N
N
Y
N