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Auto Water Feeder won't turn off
1-pipe steam, Dunkirk PSb-50 boiler, McDonnell Low Water Cut-off, Safgard auto feeder. I'm not the original owner/installer of this system.
About 3 times in the past two years, it has happened that the auto-feeder turns on during a heat cycle, calling for water when none is needed, and not stopping on its own. I have remedied this in the past by, shutting off water to autofeeder, draining the boiler, removing the probe (a one-piece brass & fiberglass deal), cleaning the crud off of it, reinstalling it and it doesn't turn back on.
Today, it happened again, so I did my usual cleaning (probe wasn't that dirty since this last happened about a month ago), but the auto-feeder valve is still open, sending water to the boiler and overfilling it. I have the water shut off to the auto-feeder for now. Boiler will still cycle on when thermostat calls for heat. Note that water isn't very dirty when I drained it.
The entire system is quite old. I'm wondering if anyone has any quick tips or advice. Thank you.