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Oilless Compressors
troubleshooting Chart
Symptom
Compressor will not run
Thermal overload
protector cuts out
repeatedly
Tank pressure drops when
compressor shuts off
Compressor runs
continuously / air output
lower than normal
Excessive moisture in
discharge air
Safety valve pops open
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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. Lack of proper ventilation/room
temperature too high
2. Excessive air usage, compressor too small
1. Open tank drain valve
2. Loose connections (fittings, tubing, air
hose, any connections, etc.)
3. Tank leaks
1. Excessive air usage, compressor too small
2. Open tank drain valve
3. Loose connections (fittings, tubing, air
hose, any connections, etc.)
4. Pump wore out
1. Excessive water in tank
2. High humidity
1. Defective pressure switch
2. Defective safety valve
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. Move compressor to a clean,well ventilated area where
temperature will not exceed 100°F.
2. Decrease usage or purchase unit with higher air delivery
(SCFM)
1. Close tank drain valve
2. Check all connections with soap and water solution. If a
leak is detected, tighten. Or remove fitting and apply pipe
tape to threads and reassemble.
tank first.
3. Check entire tank for leaks with soap and water solution
1. Decrease usage or purchase unit with higher air delivery
(SCFM)
2. Close tank drain valve
3. Check all connections with soap and water solution. If a
leak is detected, tighten. Or remove fitting and apply pipe
tape to threads and reassemble.
4. Replace pump / motor assembly
1. Drain tank, tilt tank to remove moisture
2. Move to area of less humidity; use air line filter
1. Replace pressure switch
2. Replace safety valve with genuine replacement part
6
Do not disassemble
check valve. With air in tank, bleed
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