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Boiler hot, 2 zones, both thermostats turned "Off"
We're hearing a whine lately from the 3-year old boiler. This is in a relatively small house with 2 heat zones, that use White-Rodgers zone valves. With both thermostats shut "Off", the top of the boiler is hot.
So to me it looks like the zone valve is stuck and emits a sound.
When I first had the zone valves installed (about 8-9 years ago), I did hear that these things break down fairly often and that I should have gone with circulating pumps.
My questions are: Is the heat zone valve the likely culprit? Do you think if I tapped it with a hammer, that would "unstuck" it for a while longer? Or is this a relatively expensive fix?
Thanks for any assistance. I'm in Chicago area.
(And when I was first renovating the basement, I remember this forum was awesome for getting great advice -- HVAC is kind of the weak link in my reno expertise.)