MY COMBI BOILER SOMETIMES LOOSES PRESSURE. WHEN I TOP MY SYSTEM UP TO 1.5 BAR, EVERYTHING IS FINE FOR A DAY OR TWO. THEN, THE PRESSURE GOES UP T 3.5 - 4 BAR AND STARTS VENTING AT THE OVER FLOW. I THEN BLEED THE SYSTEM BACK TO 1.5 BAR AND THE CYCLE WILL START AGAIN. ANY IDEA'S
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