Baxi Bermuda 401 back boiler heating works but no hot water?

Yep ...sounds like the 3-way diverter valve is jammed in the heating position. This is usually connected to the pump located in the airing cupboard. Looks like a small electrical box on top of a pipe and contains a motor that is inherently unreliable. You can get them for around £30 and pretty easy to install if you're reasonable with electrics.

Spilge
February 2008