Hi, could anybody help, I have a Ravenheat Combi Boiler CSI 85 which is just 4 years old and never had any problems until now, I go to turn on my hot tap and the boiler burns up but then after about 20 seconds the red light comes on and the boiler goes off, this seems to be happening everytime I switch the boiler on, last time I had the boiler serviced about 6 months ago the plumber said there was a bit of rust around the fan area could this be something to do with the boiler going off????