In program 01 - Output Source Priority: change the setting from SUb to SbU, this will silence the repetitive alarms and give you a peacefull nights sleep. After a period of time, next morning in my case, you may revert back and check if the fault persists. I am going to keep this new setting for now. Just too happy the buzzer is not going off every few seconds! I will check later (still too early) if the unit settles when when reverting back to SUb. Good Luck. Nelson