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can someone explain what is happening, furnace not snapping off
My new house has a domestic h/w system off an oil fired Burnam V-1, installed 1995. The hotwater heat has two systems, one radiant in the "old" part of the house, and a baseboard loop in the "new" part. During the summer, when I'm away from the house for a period of time, I turn the whole furance off (kill switch) to keep it from periodically heating the slug of faucet h/w in the internal coil.
When I return and snap the furnace back on. It usually runs for a few minutes and stops. When it gets it first call for hotwater at a tap, it will start again, and then , for some reason, starts sucking hotwater to the radiators (heat is turned off) while making a water hammer type sound. I don't think the water pump it on, but blistering hot water seems to be getting sucked up to at least the first floor. Doesn't seem to affect baseboard system. Even if I turn off the hot water faucet, the furnace seems to be "stuck" on, burning and burning despite no call from anywhere. The last two times, I turn it off again, let it sit a bit, and then it seems to work fine again. Any explanation? Anything to prevent this? (ps I miss my old steam furance so much)