Campbell Hausfeld HL5500 Series Operating Instructions Manual page 7

Troubleshooting Chart (Continued)
Symptom
Excessive moisture in
discharge air
Compressor runs
continuously and safety
valve opens as pressure
rises
Excessive starting and
stopping (auto start)
Air leaking from
unloader valve on
pressure switch
Possible Cause(s)
5. Broken valves
6. Piston ring worn
1. Excessive water in tank
2. High humidity
1. Defective pressure switch
2. Defective safety valve
1. Excessive condensation in tank
2. Loose connections at fittings, tubing,
etc.
3. Tank leaks
1. Check valve stuck in open position
2. Unloader valve stuck in open position
Corrective Action
5. Replace compressor valves as necessary.
6. Replace piston and cylinder.
1. Drain tank.
2. Move to area of less humidity; use air line filter.
NOTE: Water condensation is not caused by
compressor malfunction.
1. Replace switch.
2. Replace safety valve with genuine replacement part.
1. Drain more often.
2. Check all connections with soap and water solution.
If a leak is detected, (1) tighten or (2) remove fitting
and apply pipe tape to threads and reassemble.
3. Check tank for leaks with soap and water solution. If
leak is detected, tank must be replaced with genuine
replacement part.
1. Replace check valve.
2. Replace unloader valve.
7
Do not disassemble check valve
with air in tank; bleed tank
Do not disassemble check valve
with air in tank; bleed tank
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