Central Heating not turning off!

[Steveb21]

Vailiant Eco boiler which is in garage.

Usually when the weather drops thr anti freeze setting kicks in and keeps the radiators hot.

Weather is not cold atm however the radiators are warm. Hive is switched to off. Hot water is coming from the taps as normal.

Any suggestions what the issue could be? Diverter valve fault?

Thank-you

 

[CBW]

I’m guessing a combi boiler? If rads heating without demand, and preheat is on then I’d say diverter valve, which isn’t a diy task unless competent to check for safety afterwards.