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Posted by <kjpro on January 31, 2007, 11:06 pm
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> Hi
> I have a Trane "Gas-Fired Fan Assisted Combustion System" with
> "Intelli-Ignite" home furnace (model TDE060A936KZ) that I believe is
> reporting a false "Open High Limit Device" error. It will operate just
> fine for days then suddenly report this error and refuse to ignite. It
> may choose to do this upon startup in the AM while completely cold;
> having been idle all night.
> The reason I believe it's a false indication is that while it was
> reporting the error I checked each sensor to see if was open and they
> all reported closed.
Yea, things tend to report errors till they are reset.
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> Also, usually, simply cycling the breaker for the
> unit will cause it to resume normal operation.
> The filter is clean and there is ample air-flow.
Are you sure? Do you test it? If so, how?
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> So the suspect now is the control board.
Why can't it be a problem due to "lack of maintenence" or an "installation
issue"?
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> Are there diagnostics that
> can be run on these boards?
Sure, how much money you want to spent to test it?
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> Is this common for a board to just
> malfunction like so?
Not likely.
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> Is there a reset procedure?
Yes
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> Thanks.
Your welcome
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> Brian
kjpro
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>I have a Trane "Gas-Fired Fan Assisted Combustion System" with
>"Intelli-Ignite" home furnace (model TDE060A936KZ) that I believe is
>reporting a false "Open High Limit Device" error. It will operate just
>fine for days then suddenly report this error and refuse to ignite. It
>may choose to do this upon startup in the AM while completely cold;
>having been idle all night.
>The reason I believe it's a false indication is that while it was
>reporting the error I checked each sensor to see if was open and they
>all reported closed. Also, usually, simply cycling the breaker for the
>unit will cause it to resume normal operation.
>The filter is clean and there is ample air-flow.
>So the suspect now is the control board. Are there diagnostics that
>can be run on these boards? Is this common for a board to just
>malfunction like so? Is there a reset procedure?
>Thanks.
>Brian