Recent content by mikedams

Would another flush be of any benefit if the first one apparently left this problem behind?

I replaced the pcb and still have the same symptoms.

Thanks very much for your help so far. I hope you'll stay with me a bit longer. My header tank is quite full. I did that deliberately so that I could get overflow on boiling to tell me when it happens. When I had the boilder fitted (Oct 2003) they did a power flush so I dont think there...

We don't have one of those.

I dont think there's a zone valve - not sure exactly where it would be situated or look like though. There's no cylinder thermostat. We have a towel rad but I dont know where it joins the pipework exactly so dont know if its connected as a bypass or not. The boiler did go off when I turned...

Still going without the pump

When the problem occurs there is definitely overheating because hot water out of the taps is then much hotter than normal. Also you can hear it boiling if you're in the house at the time. Another thing that might help is that if I'm in the house when it happens all I have to do to stop it...

I have a potterton kingfisher MF RSL60 boiler piped with gravity feed hot water and pumped central heating. 99% of the time it runs perfectly, but every month or two (mostly in winter) it will boil over. The boiling seems to happen when the central heating has been running or a while and then...