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Unit not cooling at all Inoperative fan motor Check for fan free rotation and remove
possible obstacles. Replace fan motor if
faulty
Intervention of the compressor overload
protector
Check for fan free rotation and remove
possible obstacles. Replace fan motor if
faulty
Failure of any of compressor electrical
components(overload protector, starting
relay, starting or run capacitors)
Replace faulty electrical component
PWB failure Replace PWB
Compressor motor inoperative (shorted
or seized)
Replace compressor (see the next
chapter)
Solenoid valve not opening (coil) Replace solenoid valve coil
Solenoid valve not opening (mechanical
part)
Replace solenoid valve body
Unit not cooling at all on one side (other
side normal)
Inoperative viscosity microswitch Replace microswitch
Poor refrigerant charge Detect possible leak, seal it and make
new refrigerant charge
(PWB malfunction) only for unit
manufactured before january 2002
Replace PWB
Solenoid valve not opening (coil) Replace solenoid valve coil
Solenoid valve not opening (mechanical
part)
Replace solenoid valve body
Unit excessively freezing on one side
(other side normal)
Mixer not rotating Refer to paragraph MIXER NOT
ROTATING
Inoperative viscosity microswitch Replace microswitch
(PWB malfunction) only for unit
manufactured before january 2002
Replace PWB
Solenoid valve not closing Replace solenoid valve body
Safety pressure switch light lit Dirty condenser filter Remove dust from condenser filter
Insufficient clearance for ventilation Check for minimum of 6” (15 cm) of free
air space all around the unit
Inoperative fan motor Check for fan free rotation and remove
possible obstacles. Replace fan motor if
faulty
PROBLEM CAUSE REMEDY
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