how to mend ravenheat CSI 85T boiler?

I have a ravenheat CSI 85T Combi boiler which Ive had for seven years. I always had problems with it from day one. This current problem is something new. I turned on the heating today and it was working fine for about an hour then went off with the orange flame light showing. I swiched the boiler off and on then switched on the heating and after about half a minute the orange no flame light came on again. carried out this procedure a few more times and the same result...so I took off the sealed cover to the chamber to make sure the fan hadnt seized and was ok. i looked around to make sure everything else was ok and noticed the condensor trap was full of water, which normally travels out into the drains. i then turned the safety release to let out the water from the boiler and the pressure was not dropping. went outside to have a look and no sign of water. I heated some water in electric kettle and pored the hot water over the external pipes to thaw them out. as i was doing this i heard a gush sound which came from the boiler, it was water coming out from the top. I think it was coming out of the heat exchange. once it finally stopped and the drain pipes were clear i pressurised the boiler to restart it . now every time i put the mains switch on the boilers pump is on. can some one help please