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HU500000, HU502000
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Troubleshooting Chart (Continued)
Symptom Possible Cause(s) Corrective Action
Excessive moisture in
discharge air
1. Excessive water in tank 1. Drain tank.
2. High humidity 2. Move to area of less humidity; use air line filter.
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.