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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
2. No electrical power at wall outlet
3. Compressor has reached automatic shutoff
pressure
4. Motor overloaded
5. Pressure switch bad
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. Make sure compressor is run in a clean,
well-ventilated area.
5. Replace pressure switch.
Motor hums but cannot run or
runs slowly
1. Defective check valve
2. Defective unloader valve (on pressure switch)
3. Low voltage
4. Loose electrical connections
5. Wrong gauge wire or length of extension cord
6. Defective motor capacitor
7. Shorted or open motor winding
1. Repair or replace.
2. Repair or replace.
3. Check voltage at wall outlet with voltmeter.
4. Check all electrical connections.
5. Check extension cord chart for proper extension
cord usage.
6. Replace capacitor.
7. Replace motor assembly.
Do not disassemble
check valve with air in
tank; bleed tank
Flow blows/circuit breaker trips
repeatedly
1. Incorrect fuse size, circuit overloaded
2. Wrong gauge wire or length of extension cord
3. Defective check valve
4. Defective unloader valve (on pressure switch)
5. Defective motor capacitor
6. Motor shorted or seized
1. Check for proper fuse. Use time delay fuse.
Disconnect other electrical appliances from
circuit or operate compressor on its own branch
circuit.
2. Check extension cord chart for proper extension
cord usage.
3. Repair or replace.
4. Repair or replace.
5. Replace capacitor.
6. Replace motor assembly.
Do not disassemble
check valve with air in
tank; bleed tank
Thermal overload protector
cuts out repeatedly
1. Low voltage
2. Wrong gauge wire or length of extension cord
3. Clogged intake filter
4. Lack of proper ventilation/room temperature
too high
5. Defective check valve
6. Defective unloader valve (on pressure switch)
7. Compressor valves failed
1. Check voltage at wall outlet with voltmeter.
2. Check extension cord chart for proper extension
cord usage.
3. Clean or replace filter.
4. Move compressor to well-ventilated area.
5. Repair or replace.
6. Repair or replace.
7. Replace valve assembly
Do not disassemble
check valve with air in
tank; bleed tank
Knocks, rattles, and/or excessive
vibration
1. Loose mounting bolts
2. Tank not level
3. Cylinder or piston is worn/scored
1. Tighten bolts.
2. Use sturdy wedge/object to bring tank to level
position.
3. Replace or repair as necessary.
Tank pressure drops when
compressor shuts off
1. Loose drain valve
2. Check valve leaking
3. Loose connections at fittings, tubing, etc.
1. Tighten.
2. Remove check valve. Clean or replace.
3. Check all connections with soap and water
solution. If a leak is detected, (1) tighten or (2)
remove fitting and apply pipe tape to threads
and reassemble.