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A temperature sensor can be physically connected to the “Remote Temp. Sensor” terminals on the thermostat or the RC-2000 can obtain the outdoor temperature from a remote system. If the RC-2000 can not obtain the outdoor temperature, the heat pump compressor will not operate and the thermostat will only call for the auxiliary heat until the problem is resolved. When this occurs, the display will flash red and the “Problem With Outdoor Temperature Sensor. Some Heat Stages May Be Disabled” error me