I have same problem too just surfing and I found this site
http://85.189.44.185/Baxi/System/DATA/Dx/DS1/installation/2288/I05-2288/I05-2288.htm
Don't know if you've seen this yet.
I have a flashing red LED on the 70 degree light. If yours is similar I think its the thermostat.
Click on link above and scroll down to index list. Click on short parts list and its part 131.
I think it costs about £20 and should be easy to fit if you are moderate DIY type.
Twiggy, December 2007
