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Operating Instructions and Parts Manual
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/overworked
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 . Switch unit to OFF, wait 30 minutes to cool,
turn ON again to resume work . 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 .
bleed 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,
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