The occurrence of alarm 313 - “Buzzer test failed” in quiet environment has to be further analysed by our software engineers. We do see some potential for software improvements regarding the frequency analysis of the buzzer sound. We can confirm, that alarm 300 - “Device in failsafe” (in combination with alarm 313) is a follow-up error. Whenever the ventilation is stopped (log-off) when alarm 313 is active, bellavista automatically performs a self-test. During the self-test, the software activates and resets alarm 300 three times to check bellavistas alarming system. That’s why alarm 300 can be found in the alarm log when alarm 313 has been active after the start-up and during a running ventilation. We have added this issue/bug to the TKB Open Point List as T86.