1. Shutdown: First, unplug the power cord of the indoor unit from the socket to ensure that the indoor unit is powered off.
2. Find the reset button: On the back or bottom of the indoor unit, there is usually a small hole that says "reset" or a reset arrow sign. Please check the instruction manual of the device to confirm the exact location of the reset button.
3. Use a slender object: use a slender object, such as a pen tip, needle or paper clip, to insert into the reset hole. Hold it gently for a few seconds until you hear a click (it may take a little force).
4. Turn on the power: plug the power cord of the indoor unit back into the socket, and then turn on the equipment. At this point, the device should have been successfully reset.
5. Check operation: test the basic functions of the indoor unit, such as ringing, talking and unlocking, to ensure that everything is normal.
Note: The reset operation may cause the indoor unit to return to the factory settings. In some cases, you may need to reconfigure the device to meet your specific needs. For more information, please refer to the user manual of the device.
If you encounter problems when trying to reset, it is recommended to contact ABB customer service department or authorized service provider for technical support.