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Aquastat relay Buzzing / Chattering


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Posted by Chris on November 08, 2004 at 06:40:49:

Hello,
I've got a very small home system running and oil fired Weil-McLain P-366HE WT Boiler. This also supplies hot water through a coil on that boiler.

There is only one thermostat and one zone. Actually it has two circulators but they are wired together as one zone in a very small home.

I have been hearing buzzing or chattering coming from the relay in the Honeywell Aquastat model L8124A1007. I know it's this relay because I can feel it. It only does this when the boiler shuts off. I thought I had solved it by spraying the contacts of that relay with cleaner a few months ago. however...

Yesterday it started buzzing again so I replaced the Aquastat unit with a new L8124A. To my surprise the new unit has the exact same problem.

I'm stumped. any ideas?
Thank you very much,
Chris


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