To ensure the base station and the outdoor sensor "handshake" correctly, follow these steps in order:

“From the DCF-synced H10515,” she said, already pulling on boots. “The manual verified the pressure algorithm against the German Weather Service. It’s not wrong.”

Elena woke her partner. “We need to move the camping gear out of the basement. Now.”

: The station may have failed to sync. Try moving it to a different room and removing/reinserting the batteries at night, when atmospheric interference is lower. Fading Display