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Ah, amazing, thanks both! Did you test anything to determine that it was the switch that needed replacing or is it pretty much the only thing that could cause the boost to not-work? For a £10 might as well give it a shot anyway I guess, better than offering it up to someone who will just do this anyway and then sell for profit....
owl-
My switch went intermittent before failing, so it was easy to know.
I therefore didn't know how the circuit for the boost/no boost works, but I just googled it and apparently if it's not the switch it's the small PCB which can be replaced, see below:
https://www.diynot.com/diy/threads/henry-hoover-hi-lo-not-working.541481/There's no way of knowing which has failed, but that thread suggests that if it's the PCB it would have failed in the 'hi' mode, which would bring us back to the switch.
So yeah I'd replace the switch, if it's not that it's the PCB.
Fox
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