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CODE POSSIBLE CAUSE POSSIBLE SOLUTION
21
Air tank pressure is too high Open the regulator and reduce air tank pressure to less
than 40 PSI (275.8 kPa).
22
Engine problem Contact a D
E
WALT factory service center or a D
E
WALT
authorized service center
23
Engine or pump oil is low Add D
E
WALT synthetic compressor oil to pump. See
Compressor Pump Oil under Maintenance.
24
It is normal for some pressure drop to occur If there is an excessive amount of pressure drop when the
accessory is used, adjust the regulator as instructed in
Regulator under Features.
NOTE: Adjust the regulated pressure under flow conditions
while accessory is being used.
25
Damaged regulator Replace.
26
Detergent type oil being used in pump Drain oil and refill pump with D
E
WALT synthetic compressor
oil.
27
Extremely light duty cycles Run unit for longer duty cycles. It is recommended to run at
high throttle 50-75% of the run time and idle for 25% of the
run time.
28
Piston rings damaged or worn Contact a D
E
WALT factory service center or a D
E
WALT
authorized service center
29
Cylinder or piston damaged or worn Contact a D
E
WALT factory service center or a D
E
WALT
authorized service center
30
Compressor cylinder finish worn Contact a DEWALT factory service center or a D
E
WALT
authorized service center
31
Water in pump oil Drain oil and refill pump with D
E
WALT synthetic compressor
oil.