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TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM
Compressor shuts off
unexpectedly or won't start
Knocks, rattles, and/or excessive
vibration
Compressor runs continuously
and safety valve opens as
pressure rises
Air leaking from unloader valve
on pressure switch
POSSIBLE CAUSE(S)
1. Circuit overloaded
2. Low voltage
3. Extension cord usage - wrong gauge
wire and/or too long.
4. Loose electrical connections
5. Worn check valve
6. Defective unloader valve (on pressure
switch)
7. Defective motor capacitor(s)
8. Defective motor
9. Lack of proper ventilation /
room temperature too high
10. Clogged intake filter
1. Loose mounting bolts
2. Tank not level
3. Cylinder or piston is worn/scored
1. Defective pressure switch
2. Defective safety valve
1. Check valve stuck in an open position
2. Unloader valve stuck in open position
11
CORRECTIVE ACTION
1. Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit
2. Check voltage at wall outlet with voltmeter.
3. Remove extension cord or refer to Extension Cord
Chart on page 7
4. Check all electrical connections
5. Replace check valve
Do not disassemble check
valve with air pressure in
tank; bleed tank.
6. Replace unloader valve
7. Replace capacitor(s)
8. Replace motor
9. Move compressor to well ventilated area
10. Clean or replace filter
1. Tighten bolts.
2. Use sturdy wedge/object to bring tank to level position.
3. Replace or repair as necessary.
1. Replace switch.
2. Replace safety valve with genuine replacement part.
1. Replace check valve.
2. Replace unloader valve.
Do not disassemble check
valve with air pressure in
tank; bleed tank.
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