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Thanks. I just checked it and the interior part of the switch where the wiring contacts the assembly seems to be making a noise like something is loose as I move the wires around.

I'm going to...

Replaced the thermostats, too. :(

The signal problem seems to be from the new valve back up to the board. The valve will open every time when it calls, but the positive connection to make the heat...

Our hydronic heat system is working fine for one zone only. The second zone will only switch on 30% of the time that the thermostat actually makes its call. In order to make that zone work, we have...