Question about pump faliure
For no reason my 6 month old D4 pump starts making a whiney pitch like something is rattling inside it and then after a few minutes it goes silent again and repeats the cycle. It wasn't doing this for the 1.5 weeks I had it running prior to this when I replaced the water in the system. Is this a sign of a failing pump or could some bubbles in the system be causing this to happen? If they are bubbles, why would it start happening now and not before?
Thanks.
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