Haier 3U19FS1ERA Service Manual - Page 101

CN20 on PCB

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>_]]VbTZR\ _^UZdZ_^Vb 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. start check if the connector between pressure switch and PCB is no fixed badly or damaged (CN20 on PCB) yes replace pressure switch connector, shut off and be electrified again, re-check check if the 2 straight lugs on no the pressure switch work badly yes replace pressure switch connector, shut off and be electrified again, re-check if indoor fan motor cannot startup normally no in heating mode(except for defrost) replace main control board and check again yes check if the indoor motor has no power input replace indoor motor and check again -100-

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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
±²³³´µ¶·¸¹ º·µ ±²»¼·½·²»´µ
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.
-
1
00-