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Posted by dana on May 08, 2009 at 09:24:23:
In Reply to: Re: Loud sound at ignition in Weil McLain Ultra posted by Dave on March 16, 2009 at 16:06:02:
: I think you're on the right track. The heat exchanger has never been cleaned, only the ignitor (2 yrs ago) and condensate drain (every year). So I had an annual service done, and the guy noted that the ignitor was quite dirty although the exchanger looked great. So the theory is that it was igniting on the first try, and maybe some gas was building up somehow between attempts. It tries 4-5 times before it does a full purge. Anyway, the problem seems to be solved. I'll repost if not.
(I'm a a littl late on the response here but...)
If these are minor gas explosions (likely), and your exhaust vent is PVC (also likely with high efficiency boilers), DO check the integrity of the PVC very carefully. There have been multiple reports of carbon monoxide issues surrounding PVC venting that has been compromised (usually longitudinal splits/cracks) from micro-explosions such as that. Check the date code and operation of your carbon monoxide detectors as well, eh?
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