Have HVAC Questions? Ask an HVAC Expert for Answers
My name is Billy.
There is only one thing you can do to try and reboot system. And that is pending that the outdoor sensor is not bad.
Turn off breaker to furnace and ac.
Turn ac breaker back on
Turn furnace breaker back on
Let the thermostat "search" to try and reboot communication.
If the communication or sensor appears again I am afraid you will need to call for service. This type of system is not like the older units a homeowner could service.
sounds like you may have a board issue as well as the oa sensor.
I wish you the best and if you have further questions let me know. Once service is rated there will be 30 day follow up
I see the question is still open/unrated.
Did you need further information?
so my answer of the control board likely bad was correct.
I am sorry if you felt you could do more on this unit.
Unfortunately my response was true and very very close for not seeing the unit first hand.
I hope you have a nice holiday weekend