Haier Unitary smart series Service Manual page 174

For convertible unit and ceiling concealed unit:
compressor can not startup after
unit is switched on for 4 minutes
if indoor unit alarms other
failure codes
no
check if wiring between indoor
and outdoor is correct, power
supply is 50Hz
yes
check the 4th bit of SW5 on
PCB is at "OFF", the others
are at "ON"
yes
Replace indoor
PCB
check if the failure
is eliminated
5)Compressor discharging temperature protection
Outdoor indicator shows 00100.
Alarm condition: Within half an hour after compressor is running, compressor
discharging temperature is over 120degree for 3 times continously.
outdoor indicator shows
check if refrigerant is too
much or too less
no
check if the system
piping is blocked
no
check if discharging temp.
sensor value is normal
yes
replace PCB
yes
eliminate other
faults
yes
adjust wiring and
power supply
adjust the
no
position
no
Replace outdoor
PCB
yes
adjust refrigerant
yes
adjust piping
no
replace sensor
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