Honeywell Zone Valve Replacement

charliechicago

Hello to all

Can I replace just this zone valve head without draining the boiler? Like on the more modern ones.

hot_rod

you can replace the motor and or end switch, but you cannot remove the galvanized plate, the whole top end, without isolating or draining the system

Is it the motor, switch, or stripped sector gear, that is bad?

charliechicago

Thanks for responding.

Its the gear. The lever is no longer connected to the gears. It gets flow but is not bringing on the boiler/not making the end switch. Is that reparable without draining?

mattmia2

I believe this converts the old style valve to the new style powerhead:

https://www.supplyhouse.com/Honeywell-Home-40003918-006-2-Way-Powerhead-Conversion-Kit-Water

hot_rod

https://forum.heatinghelp.com/discussion/comment/1843215#Comment_1843215

I think the gear and kecmver are crimped tigether. If you could find a valve if the same vintage the top end can all be rebuilt without getting into the water

Although the ball inside could be damaged or stuck and that damaged the gear/ lever

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SuperTech

I usually just drain the boiler and rebuild the zone valve with a new motor and ball assembly from a new zone valve. The parts from a new HW zone valve will screw right on to the older valve body. For some reason the new zone valves don't last anywhere near as long as these old ones.

MikeL_2

After removing the power head, make sure the ball assembly behind the plate moves freely. If you can't move the protruding stem back & forth easily with your thumb & forefinger you'll need to replace the plate & ball assembly.

Often, the stiff ball assembly ( actuator ? ) is the cause of the stripped gear and failure of the end switch

charliechicago

Got it. Thanks for all the responses !