Timed or level-based electronic drain fails to cycle correctly.
1
Solenoid coil burned out
CheckMeasure coil resistance/voltage; compare to OEM spec, check for continuity.
FixReplace coil or solenoid valve assembly.
ToolsMultimeter
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2
Debris/sludge lodged in valve orifice
CheckDisassemble and inspect orifice and seat.
FixClean thoroughly; consider adding a strainer upstream.
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3
Timer board failed or misprogrammed
CheckVerify open/interval timing settings against expected condensate load.
FixReprogram or replace timer board.
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4
Water in tank overwhelming drain cycle timing
CheckCheck standing water level in receiver relative to drain interval/duration.
FixIncrease drain frequency/duration or install a zero-loss level-actuated drain.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.