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, 2
Air leaks ....................................................................................................................................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
Knocking Noise ..........................................................................................................................6
Pressure reading on the regulated pressure gauge drops when an accessory is used ...........7
Compressor is not supplying enough air to operate accessories..............................................8, 9, 10, 11, 12, 22
Regulator knob has continuous air leak ....................................................................................13
Regulator will not shut off air outlet ...........................................................................................13
Motor will not run .......................................................................................................................6, 14, 15, 16, 17, 18, 19, 20
Squealing Sound .......................................................................................................................21
CODE POSSIBLE CAUSE POSSIBLE SOLUTION
1 Pressure switch does not shut off motor when com-
pressor reaches cut-out pressure
Set the Auto/Off switch to OFF, if the unit does not shut off
contact a D
e
WALT factory service center or a D
e
WALT authorized
service center.
2 Pressure switch cut-out too high Contact a D
e
WALT factory service center or a D
e
WALT autho-
rized service center.
3 Tube fittings are not tight enough Tighten fittings where air can be heard escaping. Check fittings
with soapy water solution. Do Not Overtighten.
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