Quoting Matias Vidoni <matiasvidoni@gmail.com>:

> The diodes are in their place to suppres the spikes. I forgot to tell.
> I will try the bigger cap when I come back from the office.
> Thanks by now
>

Try disconnecting the pumps to see if it's the
contactor coil. Contactors are notoriously noisy
electrically (acoustically too, but that's not likely
to be your problem unless you're rattling a dubious
connection).

Best regards,
Spehro Pefhany



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