start
no
check if the connector
between pressure
switch and PCB is
fixed badly or damaged
(CN20 on PCB)
no
no
no
check if the 2
straight lugs on
the pressure
switch work badly
if indoor fan motor
cannot startup normally
in heating mode(except
for defrost)
replace main
control board
and check again
yes
yes
yes
replace pressure switch
connector, shut off and
be electrified again,
re-check
replace pressure
switch connector, shut
off and be electrified
again, re-check
check if the
indoor motor has
power input
replace indoor
motor and check
again
Failure 11: Low pressure switch failure
Reason: 1. Too low system pressure causes that the unit stops and the compressor protection works, the failure can
be resumed.
2. Pressure switch wire is not fixed well or in open circuit.
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1
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