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Loosing Pressure and Loosing Water Out The Pressure Relief Valve
Folks, I've got a 1927 house with a mix of old radiators and some new in-floor heat zones. It's gotten into a death spiral lately where pretty much every day it will burp a quart of water out the Pressure Relief Valve and then the system will be low in pressure and the in-floor zones stop working. And, sometimes it just looses pressure even when nothing has come out of the Pressure Relief Valve. These seem like opposite problems.
I have brought the system pressure down to close to zero and checked the pressure on the pictured Expansion tank is 12 psi. I also went and bled the seven radiators in the system and there was zero air in any of them. Please help me understand what is going on.
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