Freinds Worcester is playing up. Had two engineers out last year and had a lot of components changed plus added a magnaflow. Said he is now getting a slow flashing CH light everytime on HW demand and has to reset. Tried to show me while I was there but supprise supprise it did not happen. One thing I did notice was boiler ignites Intermittently for 2 mins after tap is turned off.. Is this normal.??? Also any suggestions on light fashing (book says ignition lockout.).. I think he will probably call someone out in the end and is also looking for someone who is up to date on this type of boiler.. southend essex area if any takers. J