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Basic Troubleshooting
313316E 45
Air compressor does not run
1. Power/function selector switch.
Set function selector switch to ON; replace switch.
2. Voltage to compressor below 105 Vac
for 110 - 120 Vac models or below
210 Vac for 240 Vac models.
Try another outlet. Reduce extension cord length
or increase extension cord gauge.
3. Loose power connections. Verify all connections are firm.
4. Excessive head pressure
(compressor hums).
Moisture frozen in air supply line.
5. Excessive head pressure
(compressor hums).
Wait for air pressure to bleed to zero.
6. Fuse. Check replaceable fuse
on compressor control board.
Replace fuse after completing motor inspection,
page 81.
7. Compressor thermal switch is open.
Ensure ambient temperature is
below 115 °F (46 °C).
Move sprayer to shaded, cooler area.
8. Low compressor performance. Worn compressor; repair compressor with
Compressor Service Kit, page 81.
Poor air spray pattern 1. Air cap or air manifold air ports
clogged.
Soak in solvent to clean.
2. Air cap worn.
Replace air cap.
3. Worn spray tip. Relieve pressure, page 21. Replace tip. Refer to gun
instruction manual, 313347.
Water in pattern 1. Water in air line. Add Water Separator Kit 257824 to air line.
Problem
What To Check
(If check is OK, go to next check)
What To Do
(When check is not OK, refer to this column)