Carrier · 38AP Air Handler
The outside air thermistor has failed. Outside air temperature reset functionality will be disabled, but the unit will continue to run under normal set point control. Outdoor ambient lockout is also disabled. The alert resets automatically when the thermistor functions correctly.
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The unit should attempt automatic reset when the thermistor is functional.
Check wiring and connections to the outside air thermistor.
If the failure persists, the thermistor or control board may need replacement.