Fronius MTG 400i K4 Instructions De Service page 49

Extraction too low
Cause: Holes in the extraction hose
Remedy: Replace extraction hose
Cause: Displaced extraction unit filter
Remedy: Replace extraction unit filter
Cause: Air passages otherwise blocked
Remedy: Remove blockages
Cause: Extraction capacity of extraction unit too low;
Remedy: Use extraction unit with higher extraction capacity;
increase extraction capacity
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