I have a fan flued condensing boiler. When it's running I get what can only
be described as a minor explosion in the boiler. This immediately causes a
sensor to cut the gas supply and the boiler goes out. The fan continues to
run and 10 seconds or so and the boiler relights. It then runs for approx 5
minutes and goes bang again. I suspected the fan (my previous posting on
fridge fan versus expensive boiler fan). I took the fan out and it runs
freely. Could be the motor is getting tired and not spinning the fan fast
enough. My thoughts along this line are the fan not pulling the gasses out
quick enough. The flame is the correct colour a nice deep blue with short
cones just above the burner. The explosion as far as I can see takes place
near the top of the boiler. What happens in the area I can see through the
sight glass, is the flame goes out. There is no yellow flame shouting down
from above or anything like that. Can any one think of another reason
before I change the expensive fan. A plumber came and had a look and of
course whilst he was here the thing wouldn't bang. He said try a shield as
the wind may be playing up the flow of gasses. But it now does it even when
there is not a breath of wind. Sorry for the long posting but I am trying
to give as much info as poss. Did you get that picture I posted.
I dont seem able to copy the link. I`ll try again
Failing that glow-worm.co.uk click on the installer and then literature and
download the install guide. There is a fault find at the bottom, which I
hope will help
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