Recent content by SRW

Hi, My Vailant boiler regularly comes up with F22. When I turn it off and on, it clears it and the hot water starts again. It appears to occur when you run a hot water tap slightly open. Boiler pressure etc is OK. This has been the case for a few years, it is nuisance especially first thing...

Hi Chris, Thank you very much for all the useful information. I took out the heat exchanger and a certain amount of rust fell out when I tapped it out and flushed it out with water. I reassembled and flushed the whole system out with a cleaner and it is working fine now. Many THanks once...

Hi Antartica, Thank you for the reply. Re blocked/scaled heat exchanger - is this likely after two years ? I will try to check this tomorrow. As for the mod coil, the boiler flame seems to change - i.e. when you increase the temperature control for hot water/CH, the flame increases in...

I have a Vaillant 828/2E turbo max plus boiler and it has worked okay for nearly two years. Since recently the hotwater temperature on the taps keeps going hot and cold. It appears the boiler heats and cuts off and fires up when the temperature drops. I have changed the NTC sensors one at a...