View the thread, titled "Boiler hot water issue & water pressure issue upstairs. please help!" which is posted in Boiler Advice Forum on UK Plumbers Forums.
Personally I would remove the tmv valve and go back to how it was originally, would be a simple alteration.
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Reply to the thread, titled "Boiler hot water issue & water pressure issue upstairs. please help!" which is posted in Boiler Advice Forum on Plumbers Forums.