For investigation the log file was available, as well as the replaced power supply.The power supply showed no malfunction.In the log file the reported power failure and restart can be confirmed.The battery charge status showed 0% and it was registered that the battery need to be replaced.The user was informed about the battery status during self test.Due to the following mains power failure the device shut down immediately.As the mains power returned the device alarmed with ventilator fail.Thus, it can be concluded that the battery pack was defective due to deep discharge.It is possible to use the device with mains power only, but in case of mains power loss the device shuts down immediately.Manual ventilation remains possible.The batteries are subject to an aging process and need to be replaced periodically during maintenance every 3 years.With a completely charged battery ventilation can be continued with the current settings for at least 30 minutes (up to 90 minutes, depending on the ventilation parameters).
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