zone valve problems

kensethwins

The system in question has 3 erie zone valves 2 work normal the middle valve opens when the t-stat calls for heat and starts to open the motorized damper and starts the burner for maybe 2 seconds. Then the gas boiler shuts down but the zone valve stays open.I'm confused if the valve was bad why does it start the cycle everytime then shut down?

hot_rod

could be the end switch

inside the valve is bad. The boiler will go off when it reaches temperature, of course.

kensethwins

zone valve issues

Thanks Hotrod

Empire_2

End switch is probably bad.

There is a micro switch on the valve and they do become corroded and sometimes will not even start the boiler at all.  Change out the power head.  Valve body can stay in place.



Peace'

Mike T.

kensethwins

end switch

Thanks Mike T.