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www.welbilt.com 800-225-9916 32
Condensing Unit Troubleshooting Chart:
Problem
Possible Cause
Corrective Action
Compressor will not run.
Main switch open
Close switch
Fuse blown
Check electrical circuits and
motor winding for shorts or
grounds. Investigate for possible
overloading. Replace fuse after
fault is corrected.
Thermal overloads tripped
Overloads are automatically
reset. Check unit closely when
unit comes back on line.
Defective contactor or coil
Repair or replace
System shut down by safety
devices
Determine type and cause of
shutdown and correct
No cooling required
None. Wait until cooling is
required.
Liquid line solenoid will not open.
Repair or replace coil.
Low pressure switch will not
close.
Replace switch
Motor electrical trouble
Check motor for open windings
or short circuit.
Loose wiring
Check all wire junctions. Tighten
all terminal screws.
Compressor noisy or vibrating
Flooding of refrigerant into
crankcase
Check superheat setting of
expansion valve
Improper pipe support
Relocate or add hangers
Worn compressor
Replace compressor
High discharge pressure
Non-condensable in system
Recover, evacuate and charge
System overcharged with
refrigerant
Remove excess charge
Discharge shut-off valve partially
closed
Open valve
Fan not running
Check electrical circuit or replace
defective fan motor
Insufficient condenser air supply
Check for cause and correct
Dirty condenser coil
Clean coil
Low discharge pressure
Faulty head pressure control
Check head pressure control
operation.
Suction shut-off valve partially
closed
Open valve
Insufficient refrigerant in system
Locate and repair leak, recover,
evacuate and recharge
Low suction pressure
Check for proper refrigerant
charge
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