Troubleshooting

Problem	Possible Cause	Solution

Compressor will not run	Loss of power or overheating	Check for proper use of extension
		cord
	No electrical power	Check to be sure unit is plugged in
		Check fuse/breaker or motor over-
		load
	Blown shop/house fuse	Replace shop/house blown fuse
	Shop/house breaker open	Reset shop/house breaker, determin-
		ing why problem happened
	Thermal overload open	Motor will restart when cool
	Pressure switch bad	Replace pressure switch
	Tank is full of air	Compressor will turn on when tank
		pressure drops to cut-in pressure

Motor hums but cannot run or runs	Low voltage	Check with voltmeter
slowly	Wrong gauge wire or length of exten-	Check for proper gauge wire and
	Wrong gauge wire or length of exten-	Check for proper gauge wire and
	sion cord	cord length
	Shorted or open motor winding	Take compressor to service center
	Defective check valve or unloader	Take compressor to service center
Fuses blow/circuit breaker trips	Incorrect size fuse, circuit overload	Check for proper fuse, use time-
repeatedly		delay fuse, disconnect other electri-
		cal appliances from circuit or operate
		compressor on its own branch circuit
	Wrong gauge wire or length of exten-	Check for proper gauge wire and
	sion cord	cord length
	Defective check valve or under loader	Take compressor to service center
Thermal overload protector cuts out	Low voltage	Check with voltmeter
repeatedly	Lack of proper ventilation/room tem-	Move compressor to well-ventilated
	Lack of proper ventilation/room tem-	Move compressor to well-ventilated
	perature too high	area
	Wrong gauge wire or length of exten-	Check for proper gauge wire and
	sion cord	cord length
Air receiver pressure drops when	Loose connections (fittings, tubing,	Check all connections with soap and
compressor shuts off	etc.)	water solution and tighten
	Loose drain valve	Tighten drain valve
	Check valve leaking	Take compressor to service center
		DANGER:
		Do not disassemble check valve
		with air in tank — bleed tank.

Excessive moisture in discharge air	Excessive water in air tank	Drain tank
	High humidity	Move to area of less humidity; use air
		line filter
Compressor runs continuously	Defective pressure switch	Take compressor to service center
	Excessive air usage	Decrease air usage; compressor not
		large enough for tool’s requirement
Compressor vibrates	Loose mounting bolts	Tighten mounting bolts
Air output lower than normal	Broken inlet valves	Take compressor to service center
	Connections leaking	Tighten connections

TROUBLESHOOTING

Problem

Possible Cause

Solution