Boiler one zone call heat but not fire up
Do you get enough heat in zone 2?
Sometimes the zone and the burner are wired and configured to operate independently. When the water temperature in the boiler gets too low then the burner comes on. This configuration could have resulted if the system was originally one zone and the second zone added at a later date.
If zone 1 always turns the burner on, then there needs to be an overlimit switch to turn the boiler off if the water gets too hot. A possible disadvantage is that zone 1 might be forced off before the room temperatures are reached.
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Last edited by AllanJ; 02-11-2010 at 08:49 PM.