Electronic condensate drain solenoid not opening or stuck open

Drain / condensate

All symptoms

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.