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Posted by =?ISO-8859-15?Q?Tekkie=AE?= on December 10, 2007, 9:52 pm
Frank P posted for all of us...
> Hi,
>
> I have z Tempstar - I think it's an older ps80 - furnace in my
> basement. Over the weekend, it has been functioning irregularly.
>
> Please excuse any misuse of terminology - I'm among other things a
> mechanic, but not an hvac guy.
>
> On the surface, somtimes the heater would go on and blow nothing but
> cool air around. So I had a look at the aggregate.
>
> Correct me if I'm wrong, please: The proper order of events is this:
>
> 1). inducer motor starts up
> 2). heating wire glows
> 3). pilot light ignites on heating wire
> 4). two gas jets ignite on pilot light
> 5). fan wheel come on.
>
> Most of Saturday, the two gas jets did not ignite, and I think it's
> safe to assume, there were no gas jets (the pilot was lit). However,
> I found that by opening the blower cabinet and pressing the 'dead-man'
> switch, and then going through the ignition sequence, I could always
> get them to ignite eventually (after maybe 8 or 10 tries).
>
> The furnace worked fine all of Sunday, but failed one single time to
> ignite this morning (Monday).
>
> Hypothesis 1). The valve is sticky or defective
> Hypothesis 2). The sensor (bi-metal?) is sticky or defective.
>
> Does this sound reasonable? Or are there better explanations?
>
> Particularly, does this sound like something that is likely to recur
> often that I need to do something about, or might there have been,
> say, some impurity or something temporarily clogging up the works?
>
> Thanks for any help. Frank
>
>
>
>
A "mechanic" asking if something needs regular maintenance - a novel idea!
--
Tekkie Don't bother to thank me, I do this as a public service.
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