Staff Answer
Sep 27, 2026 - 06:32 PM
At a setting of 8 (near the coldest), it's normal for the burner to run almost all the time, especially in warm weather. Try turning it down to 4–5 and see if it starts cycling. If it gets too cold and still won't shut off, check the thermistor. On the 1210, it should be clipped to the 2nd fin from the right. A roaring flame isn't normal, though. Clean the flue and burner, because a dirty flue can make the flame loud and lift. There's no solenoid adjustment on these.
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