False „exceeding operating temperature“ alert

Hello there,
wanted to start the first cook of the season this morning, prepped the meat and smoker. However, when firing up the Inkboard BBQ blower 027BW, I got an alert for all three probes just like below.
The device worked just fine last year and the probes are working. Proofed it by replacing the blower with my regular INKBIRD WiFi thermometer.

Turning on/off, removing and adding the device again didn’t help.
Any ideas?

Thank you,
David