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Buderus GB142 "drain plug" leaks. (what is it used for?)
Please see attached pic. My GB142 is leaking (only when cool) from what the parts listing calls the "drain plug" Part #80 on the diagram. I have been through the service manual many times, and can find no procedure at all that mentions this "drain plug". In the hopes of just cleaning it, I released the water pressure on the boiler, pulled the retainer clip (part #82), and tried (not very hard for fear of damaging something) to pull the drain plug out. It wouldn't come out. The diagram indicates it's square, so I didn't try and twist it. It appears to be loose in its socket. IE I can wiggle it ever so slightly so I don't think it's "crusted in solid", though there is mineral buildup around it as you can see, which I believe is the source of the leak
I'd like to take it out and clean it, and hopefully clean the orifice it seats into to resolve my leak. This is the first time I've seen this part leak in the 12 years I've had the boiler.
I've had to replace the pressure sensor O-Ring about every 3 years for leaking.
Does anyone have any ideas on getting this drain plug out safely ?
Thanks in advance.