Haier AB25S2SC1FA, Service Manual

Page: 156 / 182

154
[42,43] High or low pressure switch shut off failure
Reconnect Check if the pressure switch
connection is ok
If the system pressure
match the condition
that pressure switch
shut off
Make pressure switch
close,measure if terminal is
conductive by multimeter
Check if the system is
clogged
Check if the PMV coil is ok
If the system is lack of
refrigerant
Check if stop valve is open
Replace pressure switch
Check the piping system
Charge refrigerant
Check the piping system
Reconnet
Y
Y
N
Y
Y
N
Y
N
N
N
Y
N
N
Make pressure switch terminal on
PCB in short circuit, check if failure
still exists
Replace PCB
Y
Y
Replace pressure switch
and measure again
N