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york furnace of woe owmytoe 11-27-2006
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Posted by lp13-30 on November 27, 2006, 11:47 am


If the polarity of the incoming power is reversed you will still have
120 volts between black and white and the furnace will do exactly as the
OP described. I have seen it happen before-- more than once. Make sure
the black is hot and the white is neutral. Around here, about 99+% of
furnaces are connected with a pigtail and receptacle, so the polarity
can be accidentally switched easily if anything is done anywhere in the
circuit. Most furnaces will run ok during a/c use that way-- it will not
show up until the heat is fired up. Larry


AppliancePartsPros.com, Inc.
Posted by Don Young on November 27, 2006, 10:08 pm



> If the polarity of the incoming power is reversed you will still have
> 120 volts between black and white and the furnace will do exactly as the
> OP described. I have seen it happen before-- more than once. Make sure
> the black is hot and the white is neutral. Around here, about 99+% of
> furnaces are connected with a pigtail and receptacle, so the polarity
> can be accidentally switched easily if anything is done anywhere in the
> circuit. Most furnaces will run ok during a/c use that way-- it will not
> show up until the heat is fired up. Larry
>
My furnace installation manual specifically warns about this possibility.
Larry's suggestion and method of testing are both valid.

Don Young



Posted by owmytoe via HomeKB.com on November 28, 2006, 3:19 pm


thanks for the tips...flame sensor double checked, reading microamps under
use...i'm afraid ground ( white ) is indeed ground

next step: a ball peen hammer

Don Young wrote:
>> If the polarity of the incoming power is reversed you will still have
>> 120 volts between black and white and the furnace will do exactly as the
>[quoted text clipped - 4 lines]
>> circuit. Most furnaces will run ok during a/c use that way-- it will not
>> show up until the heat is fired up. Larry
>
>My furnace installation manual specifically warns about this possibility.
>Larry's suggestion and method of testing are both valid.
>
>Don Young

--
Message posted via HomeKB.com
http://www.homekb.com/Uwe/Forums.aspx/repair/200611/1


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