Posted by MarkB_MI on November 12, 2019 at 06:16:18 from (174.228.1.134):
In Reply to: Boiler control problem posted by showcrop on November 11, 2019 at 13:07:57:
Another thought: The Beckett controllers have their own internal 24V thermostat power. It will operate a thermostat but not much else. Assuming your Taco valves are 24V, there must be an additional transformer somewhere else in the boiler to operate the valves. Is it possible your dodgy valve is picking up power from the Beckett controller rather than the external transformer? That could explain the burner shutting down midway in its cycle: The load of the valve could be enough to draw down the voltage of the Beckett thermostat source to the point where the control thinks there's no call for heat.
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