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Code Possible Cause Possible Solution
20 Defective motor, motor capacitor or pressure switch. Contact D
EWALT Customer Service at 1-800-4DEWALT.
21 Air compressor is not large enough for air required Check the accessory air requirement. If it is higher than the CFM
or pressure supply of the air compressor, you need a larger air
compressor.
22 Possible defective safety/relief valve Operate safety relief valve manually by pulling on test ring. If it
still leaks, replace.
23 Excessive air tank pressure Adjust pilot valve. If problem still exists replace pilot valve.
24 Defective gaskets Replace and torque head bolts to 6 - 7 ft lb
25 Fittings not tight enough Warning drain air before tightening: tighten fittings where air can
not be heard escaping. Check joint with soap solution. Do not
overtighten.
26 Defective or rusted air tank Air tank must be replaced. Do not attempt to repair air tank.
27 Pressure regulator knob not turned to high enough pressure Adjust pressure regulator knob to proper setting or replace.
or defective pressure regulator.
28 Hose or hose connections are to small or long. Replace with larger hose or connectors.
29 Possible defective (reed) valve. Remove pump head and inspect valve plate and (reed) valve.
Clear or replace valves as required.
30 Air compressor on unlevel surface. Do not incline the air compressor more than 10˚ in any direction
while running.
31 Crankcase overfilled with oil. Drain oil. Refill to proper level with D
EWALT synthetic oil.
32 Plugged oil crankcase vent. Clean.
33 Water in oil due to condensation. Drain oil. Refill to proper level with D
EWALT synthetic oil.
34 Condensation in air tank caused by high level of atmospheric Drain air tank after every use. Drain air tank more often in humid
humidity. weather and use an air line filter.
35 Unit located in damp or humid location. Relocate unit.
36 Tanks have air pressure Bleed tanks fully.