Yep , forced hot water. Turns out some repair guy in the past (have no idea how far back) replaced the flue damper which then required a new aquastat but instead he did a jury rigged wire jumper to keep the old aquastat. That jury rigged jumper finally gave out. This guy today put in a new Aquastat (correct model for the damper) . I just hope that's the end of the problem. I'm too busy this week to be dealing with a recurring heating system problem.
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