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Mend Bar Heating Rises Running

why is pressure rising to 2.2 bar while heating is on ?

pressure rises to 2.2 bar after heating has been running for an hour. when heating switched off pressure stays up. have to drain water off to reduce to 1 bar. repeats every time heating is on. heating and hot water otherwise appear to be working normally

Arthur Crawford
March 2016
Expansion vessel faulty,leak on filling loop.
Also Hotwater heat exchanger could have pin hole leak?'

Alan
March 2016
Fault in filling loop or pressure vessel need pump air 1.7 pl. To do that drain out system or replace vessel

Ltd
March 2016

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