MITSUBISHI ELECTRIC WT03939X20 - Manual (Page 53)

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3.12.1 Starting of this function
(1) Click [Option] in the menu bar and
select [Error notification mode] -> [Error
notification mode setting/cancellation...] in
the sub-menu.
The function starts searching for units to be notified
of errors and displays a message to that effect.
(2) When the search is completed, the Error notification
mode setting/cancellation screen appears.