Thread: Boiler Leaking
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      10-23-2019, 03:27 PM   #5
ToddBlack88
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Drives: 2007 Z4MC 2010 F650GS
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Two things can cause the relief valve to discharge. The auto feeder failing to lock up/shut off, or the expansion tank is flooded/failed.

If you shut the auto feed off and it stops leaking completely, even when it fires up, then that is your issue. If the valve only leaks when the boiler is firing, then the expansion tank is the problem.

25yr plumber/gasfitter/restricted electrician
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