Boiler stuck in frost protection mode

[Worrier61]

Hi after much frustration from my boiler it seems to be stuck in frost protection mode. It basically works ie heating and hot water but when both are not required it keeps doing things including sometimes even lighting. Lights seem to suggest frost protection mode
Link to video. Will be posted soon.

 

[Worrier61]

https://drive.google.com/file/d/1KQt8sU04y7JmWPPuABxhdRnsyg0KbU2s/view?usp=drivesdk
And it will keep on doing this the whole evening until it us switched off at wall.
If I want heating no problem, but if I don't want heating have to switch off at wall but then can't have hot water obviously.
Model is biasi m96 28sm/c2

 

[Worrier61]

Video doesn't pick up noise, but it comes on and does something then goes off. Sometimes it even lights burner. Heating is definitely off