I am replacing a Honeywell 6360 thermostat with a Horstmann HRT3 and have wired it as per the instructions L to 1, N to 4 and no earth but it does not seem to be operating, does anyone know why.
Was a third wire in use with the Honeywell, ie Switched Live ?
If there are definitely only 2 wires installed they aren't likely to be Live and Neutral but will be Live and Switched Live and should go to terminals 1 and 3 of the new thermostat.
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