My Burham steam boiler shuts on and off every 90 seconds on low water. Water starts out at top of gauge glass and in less then two minutes it will go all the way down and disappear completely. Boiler will shut of on low water and before the delayed feeder goes on, the gauge glass fills all the way back up to top, and boiler restarts. this goes on all day and radiators on one side of house never get hot.
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