Troubleshooting
Service Manual
168
Initial troubleshooting
SMGB0066 rev.0 - 12/2009
Cooling mode
(1 minute power on)
Excessively high
discharge
pressure (high
pressure switch
activated)
Insufcientairowtothe
heat exchanger
clogging of the air side heat
exchanger?
Remove the clogging
Obstacles at the inlet or the outlet of
the airside heat exchanger
Remove the obstacles
Is the service area for the unit
sufcient?
Make sure the service
area
correctfanspeed? Replace the fan motor
Excesive inlet air
temperature at the
airside exchanger
Shortcircuitedairtotheunit?
Remove the cause of the
shor-circuit air
Anyheatingsourceneartotheunit? Remove the heat source
Excessively charged
refrigerant
Expansion valve opening & sub cool
Correctly charge the
refrigerant
Non -condensed gas
during the cycle
Check each temperature and each
pressure
Charge the refrigerant
after the vacuum pumping
Discharge pipe clogged Check the clogging Remove the clogging
Clogging of the strainer
Check for clogging (Symptom: You
can appreciate a temperature gradient
between strainer inlet and outlet)
Clean or replace the
strainer
Clogging of the heat
exchanger
Check for clogging Remove the clogging
Failure or malfunction of
the expansion valve
Check the connection cord and the
connector
Replace the connector
Is there an operation sound from the
coil?
Replace the coil
Is the thermistor for the compressor
normal?
Replace the themistor or
pressure sensor
Is the thermistor correctly installed on
thesuctionpipe?
Install correctly the
thermistor
Excessively high water
inlet temperature
Check water temperature Refer to the customer
Failure fan motor (not running)
Measure the motor´s terminals
resistance
Replace fan motor
Excessively high
suction pressure
Malfunction or internal
leakage of the 4-way
valve
Check the temperature difference
between the inlet and outlet of the
4-way valve
Replace the 4-way valve
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