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Posted by Noon-Air on December 16, 2006, 6:04 pm
As much time as your wasting trying to figure out how to DIY when *most*
Lennox parts are propriatary, you would be better off calling you local HVAC
pro to diagnose and correctly repair it the first time.
BTW... getting any Lennox supplier or dealer to *just* sell the part is like
pulling teeth. Even as a licensed professional, I have a bitch of a time
getting Lennox parts and when I do find them, the prices are seriously high.
Did a bit more research... how about 'bad fan timer'? Seems to me much
more likely that that listed below... unfortunately I can't reproduce
the problem on demand. I hate to just start swapping parts out.
daytona° wrote:
> Plugged secondary
> Plugged filter
> Over firing
> Weak Fan/limit
> Plugged evaporator
> Plugged (I think it's called a blow by filter) internal
>
>
>
> > I'm trying to troubleshoot the following problem with my Lennox Pulse
> > 21 furnace: the furnace fan will sometimes shut off in the middle of a
> > cycle (while the gas is still on and the furnace is pulsing).
> > Occasionally this will continue until the limit is hit. The furnace
> > has a honeywell fan/limit control but only the limit side is used...
> > I'm assuming that the blower motor is controlled elsewhere.
> >
> > I've already tried replacing the fan relay but that did not solve the
> > problem. Can anyone provide some insight as to how the blower motor is
> > controlled in the pulse 21? It seems funny that it has a fan/limit
> > control but nothing is connected to the fan side...
> >
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