Having issues with this boiler, every 24hrs or so I find the central blue light flashing. If I do a reset it will try to light and eventually will. While its trying to light the flame light under on off comes on and what sounds like the fan comes on. After 5 or so attempts if it doesn't light it goes back to blue central light flashing. Further reset and it will stay on. The boiler is 8 years old and has been serviced annually and had a fan last year.