Mystery wire

[AWCHIEF]

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?

[Rich W]

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"

[AWCHIEF]

Rich, thank you.

[HowieE]

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?

[AWCHIEF]

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

[AtomicNo13]

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.

[AtomicNo13]

The blue wire indicates gas solenoid operation, basically an on off test lamp wire.