Radiator Central Heating TRV Temperature Control

[kkossev]

Here I will summon @djh_wolf - seems like his solution is what will work in your use case also :

Reliably setting various trv set points

Just an update - works to perfection. The wife is actually beaming. Previously she hated it, but liked the cost savings. Edit. Pics. Inside that double back box, there's a nodemcu connected to a 3v relay controlling when the ac power is able to flow to the thermal actuator. All looks quite slick, to be honest. Also purchased a few momentary buttons. Plan is to have a button on the box to activate a 20 min boost, which is currently only done via software. A light too to show when the valve is ac…