Why is my Honeywell zone valve slamming closed and making a loud banging sound?
Make : Honeywell Zone valve
Model : 40004850-001
I have 4 zone valves, all the same models and only 1 has this problem. I have bled the air out of the system and don't believe this to be the cause.
Thanks for giving me the opportunity to help! It is probably a defective valve. Normally these should work pretty smoothly.
The valve is probably sticking.
More than 20 years experience.
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