Dave Ramage wrote:


Thanks for this info....another reason to consider a replacement
rather than patch it up. It also seems that the seals are asbestos
according to other posts.

This could also explain that when I tested the boiler briefly with the
cover off to see if the fan was working there was a fair bit of flame
emitted around the bottom of the fire box when it lit.

I've had one of these boilers for 23 years and it still going strong.
AFAIK you can't run the boiler without the cover on.
I too had a similar problem some years ago and it turned out to be problem
with the interlock from the fan. In my case it was a flexy tube to the
diaphram switch.
The seals are asbestos rope but that shouldn't be problem unless you remove
or dismantle the boiler.