You did not say what year your Montana was, I assume you have capacitive touch thermostats. Call Dometic customer support: (800) 544-4881
You could also reset it and see if the error comes back. To reset:
- With the HVAC unit off
- Touch mode and up at the same time, two dashes will appear
- Touch mode again, reset is complete
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate