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Replacement Taco 007 F5 suddenly buzzing
So I am visiting home for the holidays and just in time for my arrival the circulator pump on the boiler started making a loud buzzing sound.
The boiler is a 3 year old Bryant. The guy who did the install came out and replaced the Taco 007 F5, which was under mfr. warranty, with a second identical pump (which cost $170 for 2 hours of labor). Now 1 week later the replacement is buzzing. You can feel the pump vibrating when you touch it and the buzzing can be heard in every room of the house since it is transferred through the pipes.
Any ideas on what could be causing this?
1. 3 year old install, pump replaced 1 week ago
2. 7 radiators total
3. 1632 sq. ft. house
4. I bled all the radiators this time and last time, no change
5. ***A radiator which never got hot on the first floor is suddenly hot today since the pump has started buzzing. This radiator was only ever luke warm before. This makes me wonder if there is some weird air thing going on. When the guy replaced the pump a week ago he didn't drain the system or bleed the rads. He isolated the pump with the shut-off valves, drained that portion, replaced the pump, and done.
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