hi, my boilre working two minutes on hot water and central heating, and cut off, then running again after three or four minutes, its keep doing like that, is any one can hepl, all micro switch ok,hot temp, thermister ok aswell, fan running ok, in side chrom pipe getting hot, but underneath out let hot water pipe like look warm, thanks,

mohammed naim, January 2009

boiler was heating up and just getting hotter and hotter with no control on knob even though new board and thermister
was running okay for a while but now the pilot goes out after it gets up to heat and shuts off
any ideas

Darren, January 2009

i've almost the exact same problem.
central heating on mine however works fine but the hot water would go through a cycle of first of all heat up and then cool down.
switch off mains power.close flow and return valves and cold water inlet.release water from system by turning the pressure relief valve a quarter turn.
remove the white coloured drum "domestic hot water" heat exchanger and give it a thorough clean by running hot water from a bath tap through the pipes.cover one of the pipes with your thumb and allow it to fill up.then cover that one as well and shake it around and when you let go youll see all the muck come out.repeat this until clear and reassemble.
this is only one of a number of reasons however.hope this helps.

araf, January 2009