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並前往https://www.grundfos.com/uk/support/faq/why-is-the-circulator-pump-making-noise-buzzing-or-rattling-is-this-normal-what-can-be-done-about-this

Why is the circulator pump making noise (buzzing or ...

The air in the system leads to noise. The entire system must be inspected and bled. The pumps may be oversized for the system in question.

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