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Old 09-23-2021, 08:12 AM   #1
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False zone temp reading for front AC unit

Hello Everyone!

My first post here and I'm hoping someone has an idea what could be causing this condition.

I have a 2021 Montana 3855BR Legacy with the in-command system. It appears that this years model uses Coleman Mach air units. The problem I'm having is that the front A/C unit will not turn on at all. If you select fan, auto, manual it thinks about coming on for a brief moment, then right back to off. One interesting thing to note is that the zone temp is displaying 0 degrees. The
other unit displays 74 degrees and is working.

I'd be interested to hear what everyone thinks.
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Old 09-23-2021, 08:49 PM   #2
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Old 09-24-2021, 07:30 AM   #3
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If it has worked before, Iíd try :
1) Press and hold the Power Button until the display gives you an option on screen to ​Power Off​ - press this.
2) Once the display is completely black, exit the vehicle and find the BCM.
3) Remove the cover of the BCM to expose the green board.
4) Press and hold the Reset button for 2 Seconds and let go.
5) Press and hold the Power button until the display shows light.

Step 1 and 5 is like a reboot. Try that next time. If that doesnít work, then try the reset on the board.
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Old 09-24-2021, 09:58 AM   #4
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You could check and see if the thermostat wiring is connection is loose. It fixed one of mine which did the same thing.
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Old 09-25-2021, 08:26 AM   #5
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M.O.C. #26926
It is possible the wires from the remote temp sensor have come loose or broken. In the attached photo the red and white (next to each other) are the sensor wires. If resetting iNCommand doesn't work I'd check those wires at the unit (have to open up to get to the control board).

One other possibility is the wires to the Gateway (also in the unit). These are small wires in a 4 pin molex connector and I have had one that broke off at the molex.
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