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Oilless Compressors
Troubleshooting Chart (Continued)
Symptom
Compressor runs
continuously and air
output is lower than
normal/low discharge
pressure
Excessive moisture in
discharge air
Compressor runs
continuously and safety
valve opens as pressure
rises
Excessive starting and
stopping (auto start)
Notes
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Possible Cause(s)
1. Excessive air usage, compressor too
small
2. Air leaks in piping (on machine or in
outside system)
3. Broken inlet valves
4. Piston ring worn
1. Excessive water in tank
2. High humidity
1. Defective pressure switch
2. Defective safety valve
Excessive condensation in tank
Corrective Action
1. Decrease usage or purchase unit with higher air
delivery (SCFM)
2. Replace leaking components or tighten as necessary
3. Replace pump assembly
4. Replace piston assembly
1. Drain tank, tilt tank to remove moisture
2. Move to area of less humidity; use air line filter
NOTE: Water condensation is not caused by
compressor malfunction
1. Replace pressure switch
2. Replace safety valve with genuine replacement part
Drain more often
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