Status
This is a critical alarm, the unit will not operate in any mode.
Description
This code is displayed anytime there is no model data at the in the outdoor control board or the model-specific data does not match the system. The model data is electronically stored data that is used to define (among other things) compressor operation. Without model data, the unit cannot function.
Expected Operation
No operation, including the thermostat will be permitted without the model data. The model data defines the unit operation. Without this information, the unit cannot operate.
Cause
Model data has been updated with the wrong file or is corrupted, a component has been changed which does not match the pre-existing model data, or model data was not loaded (for example into a replacement control).
Solution
1. Technician must have internet access either cellular or Wi-Fi.