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Hi i have a ravenheat csi 85t and it will come on for 1 second at hi flame then drop to low for a second and cut out completley that is what it continues doing while in dhw demand the flame fluctuates up and down this process happens when in dhw mode ch is not effected. Thanks in advance

Hi guys newbie here Got a problem with above boiler CH working fine HW turn tap on it hot cold then goes lukewarm and stays lukewarm aslong as taps are on Plumber has been changed Heat exchanger plate the full diverter valve diaphram ntc but still problem persists although he did say he is...