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Possible Cause
Service cord unplugged
Fuse blown or removed
Overload tripped
Control stuck open
Wiring incorrect
Improperly wired
Low voltage to unit
Staring capacitor defective
Relay failing to close
Low voltage to unit
Overload defective
Excessive head pressure
Compressor very hot-return hot gas
Short of refrigerant
Control contact stuck
Evaporator coil iced
Restriction in refrigeration system
Dirty condenser
Overload protector
Cold control
Overcharge
Air in system
Undercharge
Relay contacts stuck
Low voltage to unit
Improper relay
Incorrect relay
Voltage too high or low
Control setting too high
Refrigerant overcharge
Dirty condenser
Evaporator coil iced
Control setting is too low
Control points stuck
Fan blade hitting shroud
Tube raffle
Vibrating fan blade
Condenser fan motor raffles
General vibration
Worn fan motor bearings
Solution
Plug in service cord
Replace fuse
Determine reasons and correct
Repair or replace
Check wiring against diagram
Check wiring against the diagram
Determine reason and correct
Determine reason and replace
Determine reason, correct or replace
Determine reason and correct
Check current, replace overload protector
Check ventilation or restriction in system
Check refrigerant charge, fix leak if req ‘d
Fix leak, add charge
Repair or replace
Determine cause, defrost manually
Determine location & remove
Clean condenser
Check wiring diagram
Differential too close-widen
Reduce charge
Recover and recharge
Fix leak, add refrigerant
Clean contacts or replace relay
Determine reason and correct
Replace
Check and replace
Determine reason and correct
Reset control
Recover refrigerant
Clean condenser
Determine reason and defrost
Reset the control
Replace the control
Reform/cut away small section of shroud
Locate and reform
Replace fan blade
Check motor bracket mounting, tighten
Compressor suspension bolts too tight
Replace fan motor
Malfunction
Compressor will not start - no hum
Compressor will not start - hums but
trips on overload protector
Compressor starts & runs, but short
cycles on overload protector
Compressor operates long or continuously
Compressor runs fine, but short cycles
Starting capacitor open, shorted or blown
Relay defective or burned out
Refrigerated space too warm
Standard temperature system freezes
the product
Objectionable noise
Refrigeration Trouble Shooting Guide
Always use a certified trained Refrigeration Technician when repair of your refrigeration system is required.