1
Timer drain coil failed
CheckListen for solenoid click on cycle; meter coil voltage.
FixReplace solenoid.
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2
No-loss drain float stuck
CheckOpen manually; inspect float chamber for sludge.
FixDisassemble and clean; replace seals.
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3
Y-strainer blocked
CheckPressure upstream OK, no flow downstream.
FixClean screen; install one if missing.
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4
Discharge line frozen / kinked
CheckTrace line; touch test in cold spaces.
FixReroute through heated space or add heat trace.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.