La Crosse WS-9016TWC Wireless Sun/Moon Forecast Station is not displaying outside temperature

My mother recently received a gift of a La Crosse WS-9016TWC Wireless Sun/Moon Forecast Station, which consists of a outdoor thermometer and a display unit. The unit worked perfectly the first time it was setup but failed to display the battery after changing the battery. We even change the battery in the outdoor thermometer, but this did not fix the problem. Here’s what we need t solve it (it’s in the manual somewhere, but the manual is not exactly easy to read).

1. Remove the battery from both the outdoor thermometer and the display unit.
2. Let it sit for a few minutes.
3. Place the thermometer and the display unit next to each other.
4. Install the battery in the thermometer.
5. Wait at least 10 minutes and then install the battery in the display unit.

This should get the outdoor temperature to appear again.