Operating Instructions and Parts Manual
Troubleshooting Chart
Symptom
Compressor will not
run
Fuses blow / circuit
breaker trips
repeatedly
ank pressure drops
T
when compressor
shuts off
Compressor runs
continuously and / or
air output is lower
than normal / low
discharge pressure
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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 5.
3. Replace check valve.
Do not disassemble check valve with
air pressure in tank; bleed 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.
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