To test the operation of the ventilation unit fans:
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Select Service menu.
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Activate the test mode by pressing the On/Off button in the right top corner of the Test display area until the value is On.
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To test the operation of the supply air fan, move the blue Supply air slider and listen how the fan speed changes according to the set output.
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To test the operation of the extract air fan, move the blue Extract air slider and listen how the fan speed changes according to the set output.