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Nope, completely jammed as it turns out. Guess I'm looking at draining down and replacing the actual valve body?

How far should it turn on a three port valve?

Gravity fed tank heating and hot water system has a 3 port Honeywell zone valve switching between HW and CH. It appears that the valve is locked open. as whenever the HW is on, the radiators heat up. The manual lever on the valve is constantly loose (no matter what state the system is set...