9
Stationary Single Stage Vertical Air Compressors
Troubleshooting Chart
(Continued)
Symptom
possible Cause(s)
Corrective Action
Reset mechanism cuts
out repeatedly or circuit
breaker trips repeatedly
1 . Lack of proper ventilation / room
temperature too high
1 . Move compressor to well ventilated area
2 . Too many devices on same circuit
2 . Limit the circuit to the use of only the air compressor .
3 . Restricted air intake
3 . Clean or replace filter element
4 . Loose electrical connection
4 . Check all electrical connections .
5 . Pressure switch shut-off pressure set
too high
5 . Replace pressure switch .
6 . Malfunctioning check valve
6 . Replace check valve .
Do not disassemble check
valve with air pressure in tank
7 . Defective unloader valve on
pressure switch
7 . Replace unloader valve
8 . Defective motor capacitor(s)
8 .Replace capacitor(s)
9 . Malfunctioning motor
9 . Replace motor .
Tank does not hold
pressure when
compressors off and the
shut off valve is closed
1 . Air leaks (fittings, tubing on
compressor, or plumbing outside
system)
1 . Check all connections with soap and water solution . Tighten; or
remove and apply sealant to threads, then reassemble .
2 . Worn check valve
2 . Replace check valve .
Do not disassemble check
valve with air pressure in tank
3 . Check tank for cracks or pin holes
3 . Replace tank . Never repair a damaged tank .
Pressure switch
continuously blows air
out the unloader valve
Malfunctioning check valve
Replace the check valve if the unloader valve on the pressure switch
bleeds off constantly when unit shuts off .
Do not disassemble check
valve with air pressure in tank
Pressure switch does
not release air when
the unit shuts off
Malfunctioning unloader valve on
pressure switch
Replace the unloader valve if it does not release the pressure for a
short period of time when the unit shuts off .
Do not disassemble check
valve with air pressure in tank
Excessive vibration
1 . Loose fasteners on pump or motor
1 . Tighten fasteners .
2 . Belt needs replaced
2 . Replace with correct size .
3 . Belt alignment
3 . Align flywheel and pulley .
