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Code Possible Cause Possible Solution
22 Tank air pressure exceeds pressure switch Set pressure switch in the “Auto” position. The motor will
"cut-in” setting. automatically start when air tank pressure drops below "cut-in”
pressure.
23 Pressure relief valve on pressure switch has Drain tanks. If problem persists,
not unloaded pump head pressure. contact D
EWALT customer service at 1-800-4-DEWALT.
24 Defective motor, motor capacitor, or pressure switch. Contact D
EWALT Customer Service at 1-800-4-DEWALT.
25 Pressure switch does not shut off motor when Move the pressure switch to the OFF position.
air compressor reaches "cut-out" pressure. If the motor does not shut off, unplug the air compressor. If the
electrical contacts are welded together, replace the pressure
switch.
26 Air compressor is not large enough for air required. Check accessory air requirement. If higher than the CFM or
pressure supply of the air compressor, then larger air compressor
is required.
27 Defective pressure switch. Replace the pressure switch.
28 Defective safety relief valve. Operate safety relief valve manually by pulling on test ring. If it
still leaks, replace the safety relief valve.
29 Excessive air tank pressure. Defective pressure switch. Replace the pressure switch.
30 Defective gaskets. Replace and torque head bolts to 6 to 7 ft lbs.
31 Fittings not tight enough.
Warning: Drain air before tightening. Tighten fittings so air can
not be heard escaping. Check joint with soap solution. Do not
overtighten
32 Defective or rusted air tank Air tank must be replaced. Do not attempt to repair air tank.
33 Pressure regulator knob not turned to high enough Adjust pressure regulator knob to proper setting or replace.
pressure or defective pressure regulator.
34 Hose or hose connections are too small or too long. Replace with larger hose or connectors.
35 Possible defective reed valve. Remove pump head and inspect valve plate and reed valve.
Clear or replace valves as required.
36 Air compressor on uneven surface. Do not incline the air compressor more than 10˚ in any direction
while running.
37 Crankcase overfilled with oil. Drain oil. Refill to proper level with D
EWALT synthetic oil.
38 Plugged oil dipstick vent. Clean dipstick vent.
39 Water in oil due to condensation. Drain oil. Refill to proper level with D
EWALT synthetic oil.
40 Condensation in air tank caused by high level of Drain air tank after every use. Drain air tank more often in humid
atmospheric humidity. weather and use an air line filter.
41 Compressor located in damp or humid location. Relocate the compressor.
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