Troubleshooting Chart
Symptom
Possible Cause(s)
Excessive moisture in
1. Excessive water in tank
discharge air
2. High humidity
Knocks, rattles, and/or
1. Loose mounting bolts
excessive vibration
2. Tank not level
3. Cylinder or piston is worn/
Compressor runs
1. Defective pressure switch
continuously and safety
2. Defective safety valve
valve opens as pressure
rises
Air leaking from
1. Check valve stuck in an open
unloader valve on
pressure switch
2. Unloader valve stuck in open
(Continued)
scored
position when turned off
position when running
Corrective Action
1. Drain tank.
2. Move to area of less humidity; use air line 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.
9
HU3508 Series
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