Warm air boiler booming when ignites


Postby spinkox » Thu Nov 12, 2009 11:46 am

My father has a Lennox Duraglass G11 warm air heating boiler and occasionally when it ignites it makes a massive boom. I thought he was exaggerating til I heard how bad it was. He has had an engineer around but it has never been solved. Any ideas??

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Postby DEEARR2 » Wed Nov 25, 2009 8:34 pm

Had similar problem with a Lennox Unit. Fault was caused by delayed ignition where the main gas was not getting to the constant pilot quick enough and causing a build up. Finally modjfied the unit by relocating the pilot assembly into the centre of the main burner bar. No explosions since.
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Postby htg engineer » Fri Nov 27, 2009 8:53 am

Possibly just needs the pilot cleaning, if the gas valve opens and the pilot flame is poor = explosive ignition.


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Postby spinkox » Mon Dec 07, 2009 11:14 am

Thanks. . .

It has been looked at by an engineer so I suspect the pilot is clean but he has run out of ideas. How easy is it to relocate the pilot assembly to the centre??

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Postby DEEARR2 » Tue Dec 08, 2009 7:14 pm

The modification is quite simple. If your engineer buys a 6mm Bundy kit,
which comprises of a length of 6mm soft alloy pipe and a selection of fittings, it is then a matter of re-location of the pilot assembly with a couple of screws and repipe back to the gas valve. GSR engineer is a must.
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