Hi. I'm looking for some help with a baxi 105e combi boiler. Central heating works fine but hot water only just runs warm and only if you have the tap open a small amount. When running a bath(very slowly) The burner light is on for 30 or 40 seconds then cuts out for about 20 seconds. Having the preheat on or off makes no dirrerence. Fortunatley I'm on homecare with British gas and they have been out probably half a dozen times with no sucess and have replaced various sensors the pump, heat exchanger, I think, the diverter valve. They have also fitted an external expansion chamber and a magiclean but I think that was to do with a problem with the central heating. Getting really frustated now!!!
ps also had new pcb

woolly, January 2010

i have had exact same problem as you to the word!4 call outs and answers everyone different.then upon reading readers digest complete diy it said if your boiler(then described my symptoms(does this i have pressure problems. advised to get small piece of hose and attach to downstairs hot tap.attach other end to cold tap. turn hot tap on first , then cold.this should blow out airlock. it worked for me. wish i knew that before spending over 400 pounds on so called(corgi engineers) hopeit helps,good old readers digest!it cost two pounds from a charity shop!

julia, February 2010

My guess is they've replaced the top section of the diverter valve. It probably needs the water section, this is quite a difficult job and can take 3 or 4 hours to complete.

Henry, January 2010