Maybe you overfilled it so it had just overflowed.
stop calling it a zone valve, a zone valve has 2 ports and acts differently, you have a 3 port mid position valve, important when you are ordering the actuator if that is indeed your problem, but you describe rumblings so doubt it is the mid position valve
yes but the person that called it a zone valve doesnt know any better, yes the "silver box" actuators on both are similar to look at but are completely different in how they work and how they fault.
Actually i do.
nope because the op described gurgling which could indicate that a zone valve might not be opening, so no circulation, but on a mid position valve there is always at least one port open so there is always circulation, hence why an S plan requires a by-pass and a Y plan doesnt, among other differences
in the same way that some places and people wrongly call them diverter valves, but they are not, a diverter valve is something different
That is because they are not 3 way they are diverter valves and only 2 way A or B
Wrong the three way is AB ,A or B
some very passionate replies - thank you for all of them!
Well the lazy barstward should have changed it, the actautor or valve requires changing so the problem will come back
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