2021 FC Temperature sensor for AC

[Bcc75]

Lento would you mind posting I picture of that. I want to try to fix mine the same way

[MMCMRET]

Originally Posted by lento

My AC is fixed and sensing the proper temperature. AS called my dealer and told them to remove the cover and pull the wire out from the wall. They then cut a piece of boot rubber to go around the wire and siliconed it to the wall. This was to insulate the wall from the sensor. Unfortunately since the sensor cover is about 1 inch in diameter the small piece of rubber wasn’t quite enough insulation. So, I removed the cover and cut a round piece of corrugated cardboard that fits tightly under the cover over the piece of rubber. I’m happy to report that the system is now working as it should. I measured the temperature at the remote sensor with a thermistor and it matches the temperature on the thermostat when the system stops running. We are at a campsite in Florida right now and it has been cycling on and off maintaining the comfort in the trailer. As far as I’m concerned the problem is solved.

Lento, a picture would be helpful. Thanks for posting all the information and keeping us up to date.

BTW, were you charged for this mod/repair?

[lento]

MMCMRET - I think I figured out how to attach photos so hopefully the two I took will appear. The first one shows the repair done by AS with the circular boot rubber attached. Notice that it does not encompass the screw holes where the cap attaches - this means that heat from the wall can still affect the thermistor. Also notice that I have pulled the wire out about 8 inches. The red tip of the wire is the thermistor and the black covering is the shrink wrap applied by the manufacturer after it was attached to the white wire. As you probably know the thermistor along with the wire that is attached is calibrated based on the length of wire and the thermistor’s resistive element. Note that the black portion had an overhand knot loosely tied in it to keep it from slipping back into the wall, which would be a disaster if that happened. I untied the knot to pass it through the cardboard insulator I made. I traced the black cover onto a piece of ⅛”corrugated cardboard (cut from an amazon shipping box). I then cut it out, and using an ice pick punched a hole in the center so the wire would slide through. I then slid it over the wire until it was up against the wall and used the ice pick to create holes in the cardboard that aligned with the holes in the wall. I then re-knotted the end of the wire and carefully pushed it back into the wall until it rested against the cardboard. The last picture is of the cap installed and you can see that I positioned the red tip of the thermistor so tha it is up agains the grill on the cap.

You will also notice in the first picture the rectangular piece of boot rubber that the AS dealer slapped over the hole where the TV cable comes through. Presumably this was to block hot air from leaking out and up to the thermistor. I would have just wedged some insulation in the hole - but what is done is done.

I hope this works for you.