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HL540200
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Troubleshooting Chart (Continued)
Symptom Possible Cause(s) Corrective Action
Tank pressure drops when
compressor shuts off
1. Circuit overloaded 1. Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit
2. Low voltage 2. Check voltage at wall outlet with voltmeter.
3. Extension cord usage - wrong
gauge wire and/or too long.
3. Remove extension cord or refer to Extension Cord Chart on
page 4
4. Loose electrical connections 4. Check all electrical connections
5. Worn check valve 5. Replace check valve
Do not disassemble check valve with
air pressure in tank; bleed tank.
6. Defective unloader valve (on
pressure switch)
6. Replace unloader valve
7. Defective motor capacitor(s) 7. Replace capacitor(s)
8. Defective motor 8. Replace motor
Compressor runs
continuously and air
output is lower than
normal/low discharge
pressure
1. Lack of proper ventilation /
room temperature too high
1. Move compressor to well ventilated area
2. Clogged intake filter 2. Clean or replace filter
3. Circuit overloaded 3. Check for proper fuse, use time-delay fuse. Disconnect
other electrical appliances from circuit or operate
compressor on its own branch circuit
4. Extension cord usage - wrong
gauge wire and/or too long.
4. Remove extension cord or refer to Extension Cord Chart on
page 4
5. Worn check valve 5. Replace check valve
Do not disassemble check valve with
air pressure in tank; bleed tank.
6. Defective unloader valve (on
pressure switch)
6. Replace unloader valve.
7. Defective motor 7. Replace motor
Knocks, rattles, and/or
excessive vibration
1. Loose mounting bolts 1. Tighten bolts.
2. Tank not level 2. Use sturdy wedge/object to bring tank to level position.
3. Cylinder or piston is worn/
scored
3. Replace or repair as necessary.
Compressor runs
continuously and safety
valve opens as pressure
rises
1. Defective pressure switch 1. Replace switch.
2. Defective safety valve 2. Replace safety valve with genuine replacement part.
Air leaking from
unloader valve on
pressure switch
1. Check valve stuck in an open
position
1. Replace check valve.
2. Unloader valve stuck in open
position
2. Replace unloader valve.
Do not disassemble check valve with
air pressure in tank; bleed tank.