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I have a two zone CH system and only the ground floor has thermostat. Top floor has TRVs. When I put both circuits on boost for an hour, an hour or two before the timed would switch it on, the ground floor does not go off again. It's likely that the space never reaches desired temperature, but...

Ideally I'd like to fix this presumably original fitting or if not replace with modern siphon.. Any tips on doing the former or removing it totally