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This is the boiler. I also traced the wires to the main heating control 19 & 20 run to the mail control (along with L & N) 19 is the blue ( this leads to the thermostat, connected to the black wire wired to the thermostat .) 20 is the brown to black.

Thanks, I have tested this with and without seeing the same outcome. My understanding is that it is optional though. From the Meross site: you can use the internal sensor to control the temperature and the external sensor to do the floor overheating protection(optional)

@EFLImpudence Yes that's correct. The boiler does not stop when the new thermostat should be turning it off. When I remove the black wire from NO (No bridge) The boiler stays on When I test with then remove the bridge (COM & L) and remove NO the boiler stays on. So the boiler will stay on with...

Sorry @EFLImpudence my mistake. There is power to the thermostat with just L & N connected. I did not connect N correctly when testing. Been back and forth with this a lot so missed that. The heating is still constantly on with just L & N connected. Cheers!

No sorry, the thermostat. The display screen is blank.

Thanks for getting back! If I remove the black wire from NO, the thermostat no longer powers up.

Hi all, I have been through the other posts on this but they don't appear to be resolving for me. I have purchased the Meross MTS200 thermostat and connected, but it does not switch the heating off. The boiler remains on constant, supplying heat. Does anyone have a thought as to why this may not...