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TROUBLESHOOTING GUIDE
SYMPTOM
Compressor will not run
Fuses blow / circuit breaker
trips repeatedly
Tank pressure drops when
compressor shuts off
Compressor runs continuously
and / or air output is lower
than normal / low discharge
pressure
POSSIBLE CAUSE(S)
1. Switch in OFF position
2. No electrical power at wall outlet
3. Compressor has reached automatic
shut-off pressure
4. Motor overheated
5. Loose electrical connection
6. ON / OFF switch bad
7. Pressure switch bad
8. Defective motor
1. Incorrect size fuse, circuit overloaded
2. Extension cord usage - wrong gauge
wire and/or too long
3. Worn check valve
4. Defective unloader valve (on
pressure switch)
5. Defective motor capacitor(s)
6. Defective motor
1. Loose connections (fittings, tubing,
etc.)
2. Open tank drain valve
3. Tank leaks
1. Excessive air usage
2. Clogged intake filter
3. Open tank drain valve
4. Air leaks in piping (on machine or in
outside system)
5. Piston ring worn
6. Broken valve (in pump)
7. Tank leaks
8. Defective pressure switch
CORRECTIVE ACTION
1. Make sure compressor is plugged in and switch is
ON.
2. Check circuit breaker or fuse at electrical panel.
3. Release air from tank until compressor restarts
automatically.
4. Allow compressor to cool for approximately 30
minutes so thermal overload switch will reset. Make
sure compressor is run in a clean, well-ventilated
area where temperature will not exceed 100°F.
5. Check all electrical connections.
6. Replace ON / OFF switch.
7. Replace pressure switch.
8. Replace pump / motor assembly.
1. Check for proper fuse, use time-delay fuse.
Disconnect other electrical appliances from circuit
or operate compressor on its own branch circuit.
2. Remove extension cord or refer to Extension Cord
Chart on page 7.
3. Replace check valve.
tank.
4. Replace unloader valve.
5. Replace capacitor(s).
6. Replace motor.
1. Check all connections with soap and water solution.
Tighten; or remove and apply pipe dope or pipe
tape to the threads, then reassemble.
2. Close tank drain valve.
3. Check tank for leaks with soap and water solution.
If leak is detected, tank must be replaced with
genuine replacement part.
1. Decrease air usage; compressor not large enough
for air requirement.
2. Clean or replace filter.
3. Close tank drain valve.
4. Check all connections with soap and water solution.
Tighten; or remove and apply pipe dope or pipe
tape to the threads, then reassemble.
5. Replace piston and cylinder.
6. Replace valve.
7. Check tank for leaks with soap and water solution.
If leak is detected, tank must be replaced with
genuine replacement part.
8. Replace switch.
9
Do not disassemble check valve
with air pressure in tank; bleed
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