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all my radiators seem to have thermostatic valves on both sides and not lockshield valves (are lockshields valves that are fixed?). to try and get the radiators at the desired temp we've been adjusting both sides.could this have affected the balance and if so could this account for cold spots at...

Hi, my combi boiler is constantly losing water pressure. After re-pressurising to about 2bars it tends to last about 5 or 6 hours before hitting zero where upon i have to refill the system. I've read various posts about leaks and pressure relief valves but i haven't spotted anything as yet...