Quote:
Originally Posted by thenry
Do you have a delay between when your DT4 calls for heat and your boiler fires up?
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The room thermostat is one in a chain of switches that need to be "closed" for the system to burn gas.
With the Boiler Controller timer set to "on", by being set to "constant" or "timed On":
Gas pressure OK
Water pressure OK
Flame lit and stable
Air pump OK
It will run the circulation pump without burning gas if the water is hot enough and the thermostat is closed.