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hugo7-
You've got a good memory! I did, and one of the issues was the boost not working actually @owl
It was just a matter of replacing the hi/lo switch with mine. If everything else is working fine that will be the most likely culprit.
https://www.averncleaningsupplies.com/products/221102-hi-illuminated-rocket-switch-numatic
Fox
Random, but anyone ever repaired a Henry Hoover in which the 'boost' function wasn't working? I'm loathe to replace, but with a big puppy and messy house we really need the maximum suction possible 😂