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This could be a couple things, but try to reset it first
1. To reset the unit, repeatedly push the SYSTEM button on the thermostat until the display reads OFF.
2. The unit lockout indicator light will remain on for up to 15 seconds after turning the system off.
3. After the unit lockout indicator light goes out, turn the system back on to the desired MODE.
4. Unit operation should resume within five minutes if heating or cooling is required.