Hi, I was called to look at one of your boilers: Baxi Instant Combi 80. The central heating is not working and the hot water is kind of intermitent. After observing it for some time, my conclusion was that it has a problem with it's diverter valve and possibly the domestic water heat exchanger. Please what do you think? Send your reply via this e-mail address: uzoechiuwaga@yahoo.com Jacob