Worcester Bosch.
I just noticed that there is a fan or pump running when the boiler isn't lit and hasn't been doing CH for quite a while. That is, the radiator without a TRV is room temperature.
Can't remember when the hot tap was last run but it isn't in the last few minutes.
So what is likely to be running?
Fan for flue?
Pump for water in the boiler?
I'll keep an ear on it - working in the airing cupboard where the boiler is - but it seems strange to have something running when the boiler isn't.
Cheers
Dave R