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troubleshooting Chart
Symptom
Tank pressure drops when
compressor shuts off
Compressor runs
continuously and air
output is lower than
normal/low discharge
pressure
Knocks, rattles, and/or
excessive vibration
Compressor runs
continuously and safety
valve opens as pressure
rises
Air leaking from
unloader valve on
pressure switch
(Continued)
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
1. Lack of proper ventilation /
room temperature too high
2. Clogged intake filter
3. Circuit overloaded
4. Extension cord usage - wrong
gauge wire and/or too long.
5. Worn check valve
6. Defective unloader valve (on
pressure switch)
7. Defective motor
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
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 4
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
1. Move compressor to well ventilated area
2. Clean or replace filter
3. Check for proper fuse, use time-delay fuse. Disconnect
other electrical appliances from circuit or operate
compressor on its own branch circuit
4. Remove extension cord or refer to Extension Cord Chart on
page 4
5. Replace check valve
Do not disassemble check valve with
air pressure in tank; bleed tank.
6. Replace unloader valve.
7. Replace motor
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.
7
HL540200
www.chpower.com
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