I have a baxi bermuda back boiler, it heats the hot water up but not the rads.pump works. any ideas guys?

it sounds like the motorised valve, it sounds like it is stuck in the position where the heat is only going to your hot water only. go to your airing cupboard where your hot water tank is, you should see a motorised valve with a wiring flex coming from it. it it has a lever at the side slide it across a couple of times, it that does not unstuck it then replace it.