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Honeywell Zone Control Question
Finished replacing my boiler with surprisingly few problems. The one exception being a zone control valve. I reused the three old ZCV's (Honeywell 9045's). Two are functioning properly, the third won't stay open. The problem looks to me to be something to do with the switch that shuts off power to the ZCV motor once the valve is open. What is happening is that once the valve opens all of the way it depresses the kill switch for the power to the ZCV motor. As soon as the kill switch is depressed the valve reverses to try to close. Once the kill switch is no longer depressed the valve reverses again trying to open until the kill switch is once again depressed. This will go on until I shut down the thermostat for that zone.
I don't understand how the ZCV can stay open once the kill switch is depressed.
Is there anything that I should look for or should I just replace the valve?