The above heating & hot water is not programmed to come on in the night BUT between 2am - 5am the valve opens, the boiler fires up then shuts down again and again. If you look at the programmer it registers nothing. The 2 slide bars for CH & HW when tuned OFF - do not stop the boiler firing up again and again.
Only shutting off the electricity to the system.
Can anyone help? PLEASE?