Heat stopped working in one of 3 zones. The heat was working fine, then one day the heat did not shut off. I lightly tapped the zone valve motor with a hammer and the end switch engaged, and heat stopped. I sprayed with a little WD-40. That happened 3 times, then the heat stopped working altogether. I replaced entire head assembly (motor and end switch), ball valve, double checked wiring, checked thermostat. Everything is working properly. The end switch engages when the thermostat calls for heat. Hot water comes to the valve, but does not seem to be passing through the valve (although I can't see, the pipe on the outflow does not get hot as do other zones when heat is on), despite the motor and end switch engaging when the thermostat calls for heat. After replacing the ball valve, I checked to be sure it was installed correctly. Not sure what else it could be? Anyone have ideas? Thanks!
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