I have a Ideal Standard E Type CF Conventional Flue gas boiler. Model no "GC41 399 57"

Lately the gas is turning on, and it does not ignite until a few seconds later. By this time there is so much gas in the system it causes a loud woof or explosion. This does not sound right!

Pilot is there and seems the same size and location as it always was, which is slightly to the side. I appreciate if it was closer it might solve the explosion, but its not moved in years.

The main jets dont appear to be blocked. The closest jet seems to strike back to the pilot.

What could I do to fix it? Do pilots need to be really close? If the pressure was too high would it cause the main jets to rush gas upwards and miss the pilot?
swchughes at gmail.com

simon, November 2009

where can I get a 24 volt transformer for this model

les, October 2012

My clock with the thermostat on the front has gone, Can I replace with a digital and do away with the one thas there

les, September 2012

We had a similar problem - in essence the pilot flame was too weak (a year's worth of accumulated junk in the pilot after some building work, with associated dust etc).
Basically cleaned out the pilot with a bristle from a wire brush and then turned up the pilot gas pressure a little - slightly more noise from the pilot, but now fires up every time. Previously it got so bad that the windows in a different room rattled!
Regrettably now thinking about pensioning the old thing off - it doesn't really have enough output to run our house at anything like a sensible (wifey-related) temeperature... and I guess it probably costs more to run than a new one. A pity though, since there's nothing in it to go wrong!

JG, January 2010