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Troubleshooting Guide
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 DeWALT technician or
your dealer.
Air leaks .....................................................................................................................................1
Air leaks in air tank or at air tank welds ....................................................................................2
Air leaks between head and valve plate ....................................................................................3
Air leaks from safety valve .........................................................................................................4
Compressor is not supplying enough air to operate accessories ............................................1, 5, 6, 7, 9, 10
Restricted air intake. ..................................................................................................................9
Oil in discharge air .....................................................................................................................9, 19, 31
Knocking Noise .........................................................................................................................4, 10, 11, 12, 13, 14
Excessive belt wear ...................................................................................................................10, 11, 14, 15
Squealing sound ........................................................................................................................10
Moisture in pump crankcase ..................................................................................................... 1, 3, 8, 17, 18, 19, 20, 21, 22
Excessive current draw .............................................................................................................14, 23, 24
Compressor won’t start in cold temperatures ..........................................................................17, 31, 32
Compressor stalls ......................................................................................................................25, 26, 27
Overheating ...............................................................................................................................24, 30, 31
Troubleshooting Codes
CODE POSSIBLE CAUSE POSSIBLE SOLUTION
1 Fittings are not tight Tighten fittings where air can be heard escaping. Check fittings
with soapy water solution. DO NOT OVERTIGHTEN.
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