169
Initial troubleshooting
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
Cooling mode
(1 minute power on)
Excessively high
discharge
gas temperature
Too much super-heat
Clogging of the expansion
valve
Replace the expansion
valve
Clogging of the strainer
Clean or repair the
strainer
Malfunction or internal
leakage of the 4-way
valve
Replace the 4-way valve
Excessively high suction
gas temperature
Gas leakage or
insufcientrefrigerant
Replace the 4-way valve
Td. thermistor failure
Measure the thermistor
resistence
Replace thermistor
Failure solenoid valve for
liquidinjection
Check the solenoid valve
activation
Replace the solenoid
valve
Clogging of the liquid
injectioncapillarytube
Check for clogging Replace capilary
Blown out fuse at the
pump suction
Pump block
Check water freezing or
clogging
Removes the clogging
Over current of the pump Check pump current Replace the pump
Freeze protection control
activated
Insufcientwaterow
Check inlet and outlet
water temperature
difference
Increasethewaterow
Pump reverse rotation
Check pump running
direction
Connect correctly the
pump wiring
Air mixed in the water Check air purger Empty the air contained
Water inlet and outlet temperature themistor failure
Measure the thermistor
resistance
Replace the thermistor
Pump reverse rotation
Check the rotation
direction
Change rotation direction
Water outlet temperature excessively low
Check that water outlet
temperature is not out of
working range
Check correct installation
Clogging of the water strainer Check the water strainer Remove the clogging
Clogging of the water side heat exchanger
Check the water side heat
exchanger
Chemical cleannig
Malfunction of the low pressure sensor
Sensor wiring - Check the
sensor characteristics
Fix wire.
Replace low pressure
sensor
Gas leakage or low quantity of refrigerant
Check leakage and super-
heat
Charge correctly the
refrigerant quantity
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