New UFH Thermostat needed?

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As I went to turn off the UFH this evening the thermostat went blank.

It seems to draw power from the mains via some pins, as I see no batteries except for the lithium clock battery.

I tried flipping the UFH switches on the left of the board, after that I tried the RCDs + Main Power, nothing.

The mess of wires is behind a blanking box down the wall below the thermostat.

Am I ready to just replace the Thermostat, or do I need a voltage tester to make sure there's power coming from the pins?


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