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pts-205109-051012,
pts-2053019-053012,
pts-206067-060612
Motor hums but
does not run or
runs slowly.
Low voltage.
Check voltage with a voltmeter.
Loose electrical
connections.
Verify wiring connection inside
pressure switch and terminal box
area.
Shorted or open motor
winding.
Bring the compressor to a service
center.
Defective check valve or
unloader.
Bring the compressor to a service
center.
Fuses blow or
circuit breaker trips
repeatedly.
Incorrect fuse size, circuit
overload.
Verify proper fuse size is being
used.
Use time-delay fuses.
Disconnect other electrical
appliances from the circuit or
operate compressor on its own
branch circuit.
Loose electrical
connections.
Verify wiring connection inside
pressure switch and terminal box
area.
Defective check valve or
unloader.
Bring the compressor to a service
center.
Knocking Noise
Loose pulley.
Tighten pulley set screw.
Loose flywheel.
Tighten flywheel screw.
Compressor mounting
screws loose.
Tighten mounting screws.
Loose belt.
Check belt tension.
Carbon build-up in pump.
Bring the compressor to a service
center.
Belt too tight.
Check belt tension.
Excessive belt wear
Loose belt.
Check belt tension.
Tight belt.
Check belt tension.
Loose pulley.
Bring the compressor to a service
center.
Pulley misalignment.
Align pulley/flywheel.
Squealing sound
Compressor pump has no
oil.
Check pump oil
Loose belt.
Check belt tension.
Restricted air
intake
Dirty air filter.
Clean or replace air filter.
Troubleshooting (continued)
