I have posted a similar question but still with no answers. Anyone out there with any ideas? My Glow worm 30ci is playing up. The water temperature fluctuates from cold to warm to cold to hot to warm to cold etc. The burners operate and seem to ignite and light fully, but then they extinguish after a few seconds before igniting again , and going through the whole process again. Thus i can hear the flame igniting many times in a few minutes which i have not heard before. Any ideas?? Thanks, Will

Will, July 2007

Sorry Will, at the end of the day you HAVE to get a corgi registered heating engineer to look at it and repair it for you. This is the law. Is it worth your families life to try and save a few quid? the answer is a resounding NO!!!

Neil, July 2008

Hi, Thanks,, it was a sludged up heat exchanger. Flushed with Sentinel x 400 which solved the problem. Thanks!
Will

Will, August 2007

The boiler was fitted 4 years ago to an existing system.Can't say whether the system was cleaned properly or not as I didn't fix it. Is this something I could possibly do myself or do I call the experts in? Thanks Will

Will, July 2007

posibly blocked plate heat exchanger.was the system cleaned properly (powerflush)before new boiler going on

smelly, July 2007