Hia, we have a baxi bahama 100 (also maybe a sentinel 100x depending on what sticker you look at?) which is playing up.
It's been cutting out for a while now when you run hot water - instead of heating the water it just goes off (the power is still on but no lights anywhere apart from the power light). Turning the boiler off for a few mins then back on again seems to make it work again for a while.
We had an engineer out to have a look at it and he said it maybe a faulty sensor (which has something to do with swapping from heating to water & back) which he is trying to order (it's been 3 weeks now!) but last night things got a bit worse.
Without running water at all & with the boiler set to heating only it kept cutting out about every 15mins and after a while the old off & on again trick seemed to stop working too. We left it off overnight & this morning it's working again but still needs turning on & off again quite often.
The engineer that came out said it was an old system that hasn't been made for at least 5 years is this true (so far I've paid £57 for him to tell me my boiler is old!) and what sort of thing should I be looking at replacing it with if need be - I have no idea which makes are good & what sort of efficiency ratings I should be looking at.
It's a 3 Bedroom semi by the way if that makes much differnece. I'm going to post over here too after doing some searching around here for similar posts ( http://www.diynot.com/
Cheers for any advice my GF keeps shouting at me & I no nothing about boilers!