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No, it really is the main switch on the fuse box. I have an old fuse box, no MCBs. My electrician is doing a safety check of all my circuits plus fitting a new fuse box with MCBs for me. Turns out my shower requires 10kW max power and is wired using wire that is too small so it blows the fuse if...

Hi Stem, thank you for the reply. It's definitely the main fuse box so not sure how the thermostat is wired up. It goes into the boiler cupboard where there is a mass of wiring for various things. Got a quote from a local electrician for £21.00 to move it so will leave it to him and ask him what...

Does anyone know why my Honeywell room thermostat still seems to switch the boiler on and off even when the main switch on the fuse box is off, meaning there should be no electrical power to the thermostat? As far as I know there is no battery backup. Not sure of the model but see if you...

Pictures of Honeywell room thermostat. Wiring plus model details.