Disabled (default): The Heat Pump does not have an auxiliary or emergency heating source.
Auxiliary: The thermostat will enable the Heat Pump as its primary heating source, but if the room does not heat at a 5°F per hour rate, then the Auxiliary heating source will be enabled. This decisions is made within 10 minutes of running the Heat Pump. The thermostat keeps the Heat Pump enabled when the auxiliary heating source is running.
Emergency: The thermostat will enable the Heat Pump as its primary heating source, but if the heat pump has ran for 1 hour and the room temperature has not reached at least 1°F from the heat set-point, then the emergency heating source will be enabled. The thermostat keeps the Heat Pump enabled when the auxiliary heating source is running.