I have lived in property for 4 years and stupidly the boiler has not been serviced in that time and not even sure when was serviced before I moved so could be well over 4 years but a min of 4.
Seems strange mine is exact same boiler has op photos and has same problem bar when I turned it off...
hi
i no this is a very old post post, but i have the exact same problem with my biasi boiler every time i run a hot tap or the shower a loud whistle sound starts from boiler in spurts and has gradually got worse over last month or so. my boiler is the same as shown in previous posts pictures...