Hi i have a worcester bosh 400 rsf and it wont fire up, the pressure has dropped and I have found that it has a leak on the front union connection - when opened up - the base of the combustion chamber was full with water, I have fixed the leak cleaned out water and still it wont fire up - any ideas?

shane, November 2012

I have also replace the AFS - when turned on the boiler goes into demand, a few clicks but the fan doesnt kick in - pressures all ok ...help!

shane, November 2012