Hi Rob~

At the bottom edge/ledge of the Passport keypad…Run your finger along the bottom…Feel the little bump ?…That's the sensor…unless an optional sensor has been installed and plugged into the circuit board.

Hold your finger on it (with the control lit up) to see if it responds…If it does not…Then I would look a bit harder for that optional sensor wire…

If there…you will find it plugged into the main circuit board on the a/c unit…open that box and you will see a plug socket on the board labeled "Alt Air" (there will be others too)…If nothing is plugged into that telephone type jack…Then you don't have one….If there is a plug & wire…Follow it to where it goes…It should be in the return air path, and not somewhere it will pick up heat other than what is passing across the a/c unit's air coil…

You can also unplug the alternate sensor, and now the Passport keypad sensor is active…see how that works…

Let me know what you come up with and we can take it from there…

Steve~

Rob~

That's good news…Just thought I would tell you that your Alt Air sensor will be much more accurate if you do not clamp on it itself…It should not touch anything but open air as it will pick up heat from any source it touches…

If you want to fasten it somewhere in the air path…Just use a wire tie (around the wire & not the sensor) with a hole and screw it into something.

You can also look in your manual for the procedure to return to factory presets…This should return you temp setting to original.

Steve~