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Carrier 58MVP120 - problem re: intermittent failure during extreme temps

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Carrier 58MVP120 - problem re: intermittent failure during extreme temps --- 02-17-2007
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Posted by Ken on February 18, 2007, 10:15 am
Bob_Loblaw wrote:
>
>
>> You have electronic problem I don't know how many
>> electronic parts you on control card but you will find
>> that problem is there. some solid state components
>> do not like cold and will simply shout down or will not
>> come on when temperature drops
>
> This is an INDOOR residential furnace, not a roof-top.
> How would the circuit board feel the outdoor temperature?
> The colder it gets outside, the more the furnace has to run, but the
> ambient temp isn't going to be felt by the indoor board.
> It may or not be a board issue, but not because of the reason you stated.
>
>
>
        To answer your question about the circuit board "Feeling the outdoor
temperature," the unit is located in a crawl space. If it were my unit,
I would look closely at the circuit board for poor solder joints. The
symptoms have all the characteristics of a intermittent solder
connection. No criticism intended, just throwing out a theory.


Radiant Heat 468x60
Posted by DIDO on February 18, 2007, 2:20 pm
Bob against my better judgment that you don't deserve answer
I will gave it to you "Regardless were equipment maybe located"
the connection failure occurs from stress, stress can be ?
pressure, vibration or temperature solid state components
are more septic to temperature then anything else.
as Ken put it, it could be bad solder connection however unless
there is some type of stress on the connection not likely it
will fail.

>
>
>> You have electronic problem I don't know how many
>> electronic parts you on control card but you will find
>> that problem is there. some solid state components
>> do not like cold and will simply shout down or will not
>> come on when temperature drops
>
> This is an INDOOR residential furnace, not a roof-top.
> How would the circuit board feel the outdoor temperature?
> The colder it gets outside, the more the furnace has to run, but the
> ambient temp isn't going to be felt by the indoor board.
> It may or not be a board issue, but not because of the reason you stated.
>
>
>
> --
> Respectfully, Bob



Posted by Bob_Loblaw on February 18, 2007, 4:10 pm


> "Regardless were equipment maybe located"
> the connection failure occurs from stress, stress can be ?
> pressure, vibration or temperature

Here's what you said, Dido...

"some solid state components
do not like cold and will simply shout down or will not
come on when temperature drops"

I said ..
"This is an INDOOR residential furnace, not a roof-top.
How would the circuit board feel the outdoor temperature?"
I also said it may be the board, but not because it's getting cold.
You figure it out.






--
Respectfully, Bob

Posted by --- on February 18, 2007, 11:57 am
Bubba, Dido and Bob,

Thank you for your thoughts on the problem. I will explore each one. I do
appreciate your time and expertise. When I get it isolated (although this
may take a while), I'll post and let you know what helped. Thanks again.

John

Posted by Bubba on February 18, 2007, 2:51 pm

>Bubba, Dido and Bob,
>
>Thank you for your thoughts on the problem. I will explore each one. I do
>appreciate your time and expertise. When I get it isolated (although this
>may take a while), I'll post and let you know what helped. Thanks again.
>
>John

............I'll be holding my breath.........
Bubba

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