I've just noticed our central heating boiler fire up with both the CH and water set to be off on the timer. We've just had a Danfoss valve replaced in the airing cupboard after discovering a leak there through the white casing (actuator?) which wasn't replaced. The heating and water are working as expected i.e. timer switches both on as and when required and radiators get hot when CH on and water is hot when required.
Can anyone explain why the boiler is doing this, seemingly when it wants to and what is needed to fix it.
Thanks in advance.
Jim
PS
I'm not a plumber or CH engineer at all so please nothing too technical.