WHEN I SWITCH MY CENTRAL HEATING ON THE PRESSURE GUAGE ON MY BOILER READS 3 BAR WHICH IN TURN OPENS THE PRESSURE RELEASE VALVE. THEN WHEN I SWITCH OFF THE CENTRAL HEATING THE PRESSURE DROPS TO ZERO. I DO KNOW THE PRESSURE RELEASE VALVE IS NOT STICKING OPEN. I HAVE ALSO BLED ALL THE RADIATORS BUT FOUND ONE SIDE OF A DOUBLE RADIATOR IN PLACES QUITE COOL. WOULD BE GRATEFUL FOR ANY ADVICE THANK YOU.
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