If it is the diaphragm, is this something that I could change myself (as you may have gathered, I am a complete novice!!) or would I be better getting an engineer.
Help please! I have a Vokera Combi Bolier (about 10 years old). Over the past few months it seems to be taking longer and longer for the hot water to kick in when the hot tap is turned on. The heating works instantly. At the moment it takes between 15 - 60 seconds from turning the tap or shower on, ...
