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TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Compressor will not run Loss of power or overheating
No electrical power
Blown shop/house fuse
Shop/house breaker open
Thermal overload open
Pressure switch bad
Tank is full of air
Check for proper use of extension
cord
Check to be sure unit is plugged in
Check fuse/breaker
Replace shop/house blown fuse
Reset shop/house breaker, determining
why problem happened
Motor will restart when cool
Replace pressure switch
Compressor will turn on when tank
pressure drops to cut-in pressure
Motor hums but cannot run or runs
slowly
Low voltage
Wrong gauge wire or length of exten-
sion cord
Shorted or open motor winding
Defective check valve or unloader
Check with voltmeter
Check for proper gauge wire and cord
length
Take compressor to service center
Take compressor to service center
Fuses blow/circuit breaker trips
repeatedly
Incorrect size fuse, circuit overload
Wrong gauge wire or length of exten-
sion cord
Defective check valve or under loader
Check for proper fuse, use time-delay
fuse, disconnect other electrical appli-
ances from circuit or operate compres-
sor on its own branch circuit
Check for proper gauge wire and cord
length
Take compressor to service center
Thermal overload protector cuts out
repeatedly
Low voltage
Lack of proper ventilation/room tem-
perature too high
Wrong gauge wire or length of exten-
sion cord
Check with voltmeter
Move compressor to well-ventilated
area
Check for proper gauge wire and cord
length