Boiler cuts off too quickly on hot water demand. I fit hte temperature gauge on the Flow ( T1) and the return ( T2) to chechk weather the heat exchanger is blocked or not. But because the temperature difference ( T1-T2) is about 20 degrees cel. it is highly likly that the plate heat exchanger is not blocked. SO then why the burner is going from high to low and cuts off while the hot water at the tap is just luke worm?
