1. If you are not already in the default screen, press the left arrow key (key 3) until the screen looks similar to the image below.

2. Press the enter key (key 8). The screen will now appear as the image below.

3. Press the right arrow key (key 5). The screen will now appear as the image below.

4. Press the right arrow key (key 5). The screen will now appear as one of the images below.

5. Press the enter key (key 8) to toggle the heat setting on or off.

6. Press the left arrow key (key 3) until the default screen is displayed.