Trane CGCN Installation Operation & Maintenance page 62

SYMPTOM Cooling
N Frost in the X
compressor
intake pipe
X
X
X
X
O The
defrosting
cycle is never
activated
P Abnormal X
noises X
detected in
the
system
Q Unit does X
not start
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CG-SVX045A-GB August 2018
Heating Who can take
corrective
action
X S
S
X S
X S
X S
X S
X S
X S
X S
X s
Probable cause
Expansion device that is not
working properly
Water circulation pump blocked
Water circulation pump defective
Low refrigerant charge
The liquid filter is clogged
4-way reversing valve defective
The defrost thermostat is worn out
or has an incorrect calibration
value
Compressor noisy
The panels vibrate
phases of the supply network
reversed
Possible remedy
Verify replace
Unlock the pump
Check the pump and replace if
necessary
See point G
Replace
Check the power supply and the coil of
the valve and replace the valve
Check and replace if defective or change
the calibration value
Check and replace if necessary
Fasten properly
Invert phases