Mitsubishi Electric AG-150A Instruction Book page 19

(5) In the [Filter Sign Display] section, select whether to display the filter sign. Select [ON] to display the filter
sign and [OFF] not to.
When the filter sign display is set to "OFF," the filter sign on neither the LCD of the AG-150A nor the
monitor screen on the Web browser will appear, even when the indoor unit detects a filter sign.
If the filter is regularly cleaned and the filter sign display is unnecessary, set it to [OFF].
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