The PSI on my hot water boiler is 0.
Over the summer for no apparent reason, my expansion tank began leaking. I'm not sure if it was the actual tank or the valve. Anyway, I was a dummy and ignored it. It continues to drip on occasion.
I turned on the heat recently and noticed that I was not getting heat in all 4 zones. In fact, I never know which zone will be giving me heat. Today I looked at the gauges and noticed that the PSI was O. I think it was normally around 14 or so.
What could be the reason for the 0 PSI? Is there anything I can do to fix it? I'd like to exhaust all options before calling for a repair.