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Old 08-07-2015, 09:07 AM   #1
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Mystery wire

Yesterday while replacing my thermistor discovered a blue wire to nowhere coming out of the controller board box. It is listed as #7 blue in the schematic. Any clue as to its function? Click image for larger version

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Old 08-07-2015, 01:10 PM   #2
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I have one too, It's a test lead. In the schematic, at the end of the wire it has a 'T', and the diagram says "Test Point"
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Old 08-08-2015, 06:47 AM   #3
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Rich, thank you.
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Old 08-08-2015, 08:54 AM   #4
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Mike

What caused you to change the thermistor? I have had questions about mine for some time. How much trouble was it to get it through the wall?
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Old 08-08-2015, 10:05 AM   #5
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I wanted to be able to adjust the temp. Sliding the thermistor up or down was not doing the job. I used the snip-the-tip adjustable thermistor that does not have to go thru the wall. Wire is cut and new adjustable thermistor is spliced in using supplied screw on water resistant splices. 5 minute job. Trick now is getting it properly adjusted with the temps being so hot and the sun on the fridge side. A local RV HVAC tech recommended it.
Product Listings for Snip The Tip
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Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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Old 08-08-2015, 10:08 AM   #6
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Mystery wire

It's a 5 minute job. There is a grommet that needs to be pushed out then the wire pulled from behind the coils, reverse to replace. I believe the value is at 90 ohms at 72 degrees.
DigiKey has them for less than $2, just solder in the replacement.
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Old 08-08-2015, 10:10 AM   #7
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The blue wire indicates gas solenoid operation, basically an on off test lamp wire.
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