1
Load solenoid failed
Rotary screw
CheckListen for solenoid click on load command; measure coil voltage.
FixReplace solenoid; verify control air clean and dry.
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2
Pilot air filter clogged
Rotary screw
CheckBowl visibly fouled; pressure low downstream.
FixReplace filter element; drain bowl.
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3
Blowdown valve stuck
Rotary screw
CheckSump pressure doesn't drop on unload (should drop to ~30 PSI).
FixRebuild blowdown valve; check muffler.
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4
Pilot regulator out of adjustment
Rotary screw
CheckPilot pressure vs OEM spec (typ. 90–100 PSI).
FixAdjust per manual.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.