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Troubleshooting Chart (Continued)
Symptom
Tank pressure drops
when compressor shuts
off
Air output lower than
normal/low discharge
pressure
Excessive moisture in
discharge air
Compressor runs
continuously
Excessive starting and
stopping (auto start)
Air leaking from
unloader on pressure
switch
Possible Cause(s)
1. Loose connections (fittings, tubing,
etc.)
2. Loose drain cock
3. Check valve leaking
1. Clogged intake filter
2. Air leaks in piping (on machine or in
outside system)
3. Broken inlet valves
4. Piston ring broken
5. Cylinder or piston ring is worn or
scored
1. Excessive water in tank
2. High humidity
1. Defective pressure switch
2. Excessive air usage
1. Excessive condensation in tank
2. Air leaks in piping (on machine or in
outside system)
3. Tank check valve leaking
Check valve stuck in an open position
Corrective Action
1. Check all connections with soap and water solution
and tighten
2. Tighten
3. Disassemble check valve assembly, clean or replace
DANGER
!
1. Clean or replace
2. Replace leaking components or tighten as necessary
3. Have authorized service representative repair unit
4. Replace
5. Replace
1. Drain tank
2. Move to area of less humidity; use air line filter
1. Replace switch
2. Decrease air usage; compressor not large enough for
air requirement
1. Drain more often
2. Replace leaking components or tighten as necessary
3. Replace or repair as necessary
DANGER
!
Remove and replace check valve
DANGER
!
7
WL Series
Do not disassemble check valve
with air in tank; bleed tank
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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