TROUBLESHOOTING GUIDE
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 7.
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.
MAINTENANCE
/
REP
AIR
TROUBLESHOOTING
OPERA
TION
ASSEMBL
Y /
INST
ALLA
TION
SAFETY /
SPECIFICA
TIONS
GETTING ST
AR
TED
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