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Troubleshooting Chart (Continued)
Symptom Possible Cause(s) Corrective Action
1. Excessive air usage, compressor too
small
2. Clogged intake filter
3. Loose connections at fittings, tubing,
etc.
4. Tank leaks
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 an open position
2. Unloader valve stuck in open position
1. Decrease usage or purchase unit with higher air
delivery (SCFM).
2. Clean or replace.
3. 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.
4. Check tank for leaks with soap and water solution. If
leak is detected, tank must be replaced with genuine
replacement part.
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.
Do not dissassemble
check valve with air in
tank; bleed tank
1. Repair or replace check valve.
2. Repair or replace unloader valve.
Do not dissassemble
check valve with air in
tank; bleed tank
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)
Air leaking from
unloader valve on
pressure switch
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