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This section provides a list of the more frequently encountered malfunctions, their causes and corrective actions. The operator or maintenance
personnel can perform some corrective actions, and others may require the assistance of a qualified D
eWALT technician or your dealer.
Problem Code
Excessive air tank pressure-safety valve pops off ......................................................................1
Air leaks ....................................................................................................................................2
Continuous air leak at unloader valve. .......................................................................................3
Air leaks in air tank or at air tank welds ....................................................................................4
Air leaks between head and valve plate ....................................................................................5
Air leaks from safety valve .........................................................................................................6
Compressor is not supplying enough air to operate accessories..............................................2, 7, 8, 9, 10, 12, 13
Restricted air intake. ..................................................................................................................12
Excessive vibration ....................................................................................................................14, 15
Knocking Noise ..........................................................................................................................6, 13, 14, 15, 16, 17, 18, 19
Excessive belt wear ...................................................................................................................13,14,16,19,20
Squealing sound ........................................................................................................................13
Engine will not run .....................................................................................................................21, 22, 23, 34
Pressure reading on the regulated pressure gauge drops when an accessory is used ...........24
Regulator knob has continuous air leak ....................................................................................25
Regulator will not shut off air outlet ...........................................................................................25
Moisture in pump crankcase ......................................................................................................2, 5, 11, 26, 27, 28, 29, 30, 31
Pump will not run .......................................................................................................................32
Air tank pressure will not build ...................................................................................................32, 33