Thanks for that very quick response.
I think it was stuck in the B position when it last acted up. At the moment it is behaving itself i.e. if I adjust the thermostat it correctly turns itself on and off so I need to wait for it to go wrong again before I can be certain what position it is...
Hi
Have a problem with my central heating; it doesn’t always turn off when thermostat reaches set temp and clicks off. The pump and boiler keep going; radiators remain hot. Usually have to turn thermostat back up to full, leave a minute or so then lower and often this does the trick. It...