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Old 08-16-2022, 11:04 AM   #1
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Another basement air question

2003 winny 46515811 a/c...I have abroken wire on the outdoor sensor terminal.
(small thin white wire)..Does this affect the operation of the heat pump?? I do not get outdoor fan or compressor coming on
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Old 08-16-2022, 05:39 PM   #2
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Hi
If you can easily get to that wire and it has a little slack, just strip the ends and twist them together and use a wire nut to secure, as long as it's obvious that the wire broke all should be fine. If wire is tight but you can still access use a wire of same size and tie between the two ends. With luck your system will work. Make sure there are signs of burning before you do this, if in doubt leave well aloan get electrician to help.
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Old 08-16-2022, 06:16 PM   #3
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Just wanted to follow up with a safety concern, as I mentioned if any sign of burning, be sure to look for what may have caused it to break it may have rubbed or got trapped and vibration eventually caused it the wear and brake, the fact that it's a thin white wire suggests it's a low voltage control wire from thermostat.
But again if not sure or comfortable doing this have an electrician look at it for you.
Be safe
Good Luck
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Old 08-17-2022, 12:01 AM   #4
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The wire you describe sounds like the wires to the "ptc" resistor. (positive temperature coefficient). These little devices are placed in the fins of the coils to detect freezing temperatures and the control board will shut down the compressors when the coils start icing up. I suspect open circuit looks like icing and is keeping the system form starting up

You will need to solder the broken wires back together.

If you could post a picture of the wires that could confirm it's the ptc wires.... or something else.

Good luck,
Bill
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Old 08-18-2022, 11:21 AM   #5
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basement air

thanks Bill, I will send a pic..Should there be continuity through the sensor, or is it open??
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Old 08-18-2022, 01:46 PM   #6
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Quote:
Originally Posted by BUDDIESMITH View Post
thanks Bill, I will send a pic..Should there be continuity through the sensor, or is it open??
A ptc will have a nominal resistance and not measure open or short. The resistance could be just about anything like 1.5Kohm, or 10Kohm or 75 ohms.
There are 2 ptc's, one in the outdoor coils and one in indoor coils. I would assume they are identical so you could measure one against the other. I doubt that either one is bad, unless the wire lead of the ptc broke off right at the base so there's no way to solder it.
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