Leaking Relief Valve
I finally got around to bleeding my radiators today. Two had a little bit of air (30-60 seconds to bleed). 6 hours later, I was in the basement and heard the relief valve blow.
Last year, draining half the expansion tank cleared a slow drip from the relief valve. But today, it didn't stop the slow steady stream coming out of the relief valve. So I shut off boiler, the feeder valve, boiler in and out valves and still got water coming out. I assume the only place it could come from is the expansion tank. I opened up the relief valve and it finally drained out the remaining few gallons.
I plan on checking to make sure the expansion tank is empty in the morning and then turning on the system. Is there a particular order to opening the valves? Would you bother seeing if the valve is still leaking first or just replace it?
An expansion tank should never be just half drained.
Post pics of your set up. Otherwise, no real way to tell you what order to do anything with your system.
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