We have this standalone bath tap/shower unit (manufacturer unknown). We only use the bath tap but when we do it frequently/always produces a tiny but problematic flow from the shower head. I can't tell if it's siphoning - usually if I drain the shower pipe by lowering it below the outlet into the bath first, it will behave but not always. Worst comes to worst I'll put a bung in the shower feed but I'd like to get it sorted (long list of snags we're sorting!). The little twisty knob that determines bath or shower doesn't get messed with but doesn't seem very "precise", could there be a washer needs replacing?
TIA,
T
TIA,
T