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Operating Instructions
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Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
Compressor will not
run
1. Switch in OFF position 1. Make sure compressor is plugged in and switch is ON.
2. No electrical power at wall
outlet
2. Check circuit breaker or fuse at electrical panel.
3. Compressor has reached
automatic shut-off pressure
3. Release air from tank until compressor restarts
automatically.
4. Motor overheated 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. Loose electrical connection 5. Check all electrical connections.
6. ON / OFF switch bad 6. Replace ON / OFF switch.
7. Pressure switch bad 7. Replace pressure switch.
8. Defective motor 8. Replace pump / motor assembly.
Fuses blow / circuit
breaker trips
repeatedly
1. Incorrect size fuse, circuit
overloaded
1. Check for proper fuse, use time-delay fuse. Disconnect
other electrical appliances from circuit or operate
compressor on its own branch circuit.
2. Extension cord usage - wrong
gauge wire and/or too long
2. Remove extension cord or refer to Extension Cord Chart on
page 5.
3. Worn check valve 3. Replace check valve.
Do not disassemble check valve with
air pressure in tank; bleed tank.
4. Defective unloader valve (on
pressure switch)
4. Replace unloader valve.
5. Defective motor capacitor(s) 5. Replace capacitor(s).
6. Defective motor 6. Replace motor.
Tank pressure drops
when compressor
shuts off
1. Loose connections (fittings,
tubing, etc.)
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. Open tank drain valve 2. Close tank drain valve.
3. Tank leaks 3. Check tank for leaks with soap and water solution. If
leak is detected, tank must be replaced with genuine
replacement part.
Compressor runs
continuously and / or
air output is lower
than normal / low
discharge pressure
1. Excessive air usage 1. Decrease air usage; compressor not large enough for air
requirement.
2. Clogged intake filter 2. Clean or replace filter.
3. Open tank drain valve 3. Close tank drain valve.
4. Air leaks in piping (on machine
or in outside system)
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. Piston ring worn 5. Replace piston and cylinder.
6. Broken valve (in pump) 6. Replace valve.
7. Tank leaks 7. Check tank for leaks with soap and water solution. If
leak is detected, tank must be replaced with genuine
replacement part.
8. Defective pressure switch 8. Replace switch.