Hisense AHM-080HCDSAA - Page 328

307
Troubleshooting
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Insu󰀩cient cooling
process
Excessively high
discharge pressure
Insu󰀩cient air ow at
the outdoor unit heat
exchanger
Clogging of the outdoor unit heat
exchanger?
Remove the clogging
Obstacles at the inlet or the outlet
of the outdoor unit heat exchanger
Remove the obstacles
Is the service area for the outdoor
unit su󰀩cient?
Secure the service area
Correct fan speed? Replace the fan motor
Excessively high air
temperature to the
outdoor unit heat
exchanger
Short-circuited air to the outdoor
unit?
Remove the cause of the short-
circuited air
Any other heat load near the
outdoor unit?
Remove the heat source
Excessively charged
refrigerant
Expansion valve opening Correctly charge the refrigerant
Non-condensated gas
in cycle
Check each temperature and each
pressure
Charge the refrigerant after the
vacuum pumping
Clogging of the
discharge piping
Check for clogging Remove the clogging
Failure or malfunction
of the expansion valve
Check for clogging Remove the clogging
Check the connection cord and
the connector
Replace the connector
Is there an operation sound from
the coil?
Replace the coil
Is the thermistor on the
compressor normal?
Replace the thermistor
Is the thermistor installed correctly
on the compressor?
Correctly install the thermistor
Malfunction or internal leakage of the 4-way
reversing valve
Check the temperature di󰀨erence
at the inlet and the outlet of the
4-way reversing valve
Replace the 4-way reversing
valve
Excessively low
suction pressure
Malfunction or internal
leakage of the 4-way
reversing valve
Check the temperature di󰀨erence
between the inlet and the outlet of
4-way reversing valve
Replace the 4-way reversing
valve
Discharge temperature of the outdoor unit is
unstable
Check the expansion valve of the
outdoor unit
Replace the failed expansion
valve of the outdoor unit