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I have two plinth heaters on either side of my kitchen island. Since the rest of the house is hydronic, I presume that these are hydronic (there is a zone valve at the boiler) with electric fans because they have fan speed switches and not much heat comes out unless these are on.

I have just tried to replace the existing thermostat with a Honeywell RTH2300. I barely use this zone so I went with something easy. However even though the wires are hooked up the same way (G Y W Rh Rc) and set the temp to engage, nothing happens. The fans don't even turn on. The thermostat looks like it is engaged but the fans don't come on. One unique thing I have never seen before is that this thermostat has a switch that says gas/oil and electric. My system fits both descriptions (ie I have a gas run boiler but I have a G wire to allow the thermostat to call the fans when it calls for heat).

I have tried both switch settings with no results. Could this thermostat not be compatible with this heat zone?

  • Can you trace the wires that control the zone valve on that heat zone? – ThreePhaseEel Feb 3 at 0:06
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Stupid me. The fan has a delay of a few minutes after the thermostat calls for heat. I set it to gas and called for heat and waited 10 or so minutes and the fan came on.

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