Grounding or line polarity fault on furnace
#1
12-31-10, 05:12 PM
Grounding or line polarity fault on furnace
I've replaced a faulty electric furnace control board, due to lack of voltage to the HSI. Now, I get the error "grounding or line polarity fault". I've verified polarity of neutral to hot of the mains, no voltage between neutral and ground, and minimal resistance between neutral and ground, all at the unit. If I swap neutral & hot at the unit, the polarity error still occurs.
- Is it possible that this could be the result of reversing the wires that go to L1 and COOL?
- Could it have anything to do with the W & R wires from thermostat either being swapped, or touching the furnace chassis (wires are old; insulation is minimal)?
- Is it possible that this could be the result of reversing the wires that go to L1 and COOL?
- Could it have anything to do with the W & R wires from thermostat either being swapped, or touching the furnace chassis (wires are old; insulation is minimal)?
#3
12-31-10, 06:44 PM
Banned. Rule And/Or Policy Violation
Sounds like your new board is no good. It happens.
Replace it again. It should be guaranteed by whoever you purchased it from.
Replace it again. It should be guaranteed by whoever you purchased it from.
#4
01-01-11, 08:19 AM
Unfortunately, I bought it from ebay seller "Actual Technicians Heating & Air". Down in the fine print, it says "This Board DOES WORK! IT DOES NOT COME WITH ANY WARRANTIES!! "
#5
01-01-11, 06:26 PM
Banned. Rule And/Or Policy Violation
Actually, the seller has made an express warrantee --- that it will work. Just no OTHER warranties.
Implied warranty - Wikipedia, the free encyclopedia
I'd ask for a replacement of the board or your money back under that guarantee!
Implied warranty - Wikipedia, the free encyclopedia
I'd ask for a replacement of the board or your money back under that guarantee!
#6
01-01-11, 07:10 PM
My Hat's off to Skip4661 for giving the answer that caused this board to begin working properly!!! I swapped low voltage leads from the transformer, and all is well.
And now, the rest of the story... Originally, I had hoped that the HSI was bad. I incorrectly AssUMed that it operated on DC, rather than AC. You get the picture.. I connected the HSI leads to the meter and, sure enough, found no DC voltage. I signed up for JustAnswer.com and ponied up $12 for an answer from an expert. Unfortunately, the expert overlooked the fact that I said I checked for DC voltage, and he advised me to purchase a new control board. Fortunately, I did have a spare ignitor to install, since a subsequent AC voltage test showed the board was fine.
And now, the rest of the story... Originally, I had hoped that the HSI was bad. I incorrectly AssUMed that it operated on DC, rather than AC. You get the picture.. I connected the HSI leads to the meter and, sure enough, found no DC voltage. I signed up for JustAnswer.com and ponied up $12 for an answer from an expert. Unfortunately, the expert overlooked the fact that I said I checked for DC voltage, and he advised me to purchase a new control board. Fortunately, I did have a spare ignitor to install, since a subsequent AC voltage test showed the board was fine.
#7
01-02-11, 12:29 AM
Banned. Rule And/Or Policy Violation
Well------------ Good for Skip!
With the polarity of the furnace verified, it didn't occur to me to check further.
With the polarity of the furnace verified, it didn't occur to me to check further.
