Baxi FS401

[DP]

This boiler has a long main burner and a Honeywell pilot assembly to left of main burner. Pilot burner is secured to the combustion chamber cover through a triangular cut. Pilot burner orientation is such that the pilot burner points AWAY from the main burner. Perhaps this ‘misalignment’ between main and pilot burners occasionally results in explosive ignition that can be seen as glow at the RS terminal on a dark night.

For some unexplained reason, pilot also tends to go out randomly when boiler is running. It does not extinguish when boiler idle. Gas valve release time is 43 seconds after pilot extinguished.

This is the second FS401 that I have encountered which randomly ‘self cleans’ itself with explosive ignition.

Can people familiar with this model please suggest what the cause and cure is as I have run out of ideas.

Same message posted on Combustion Chamber for closed section replies.

Thanks in advance

Dan

 

[namsag]

If memory serves me right had one doing it many moons ago in the top there was a baffle plate 2 screws holding it that instructions said had to be in. And with it removed it worked perfectly ok