loud noisy humm in transfer switch
My transfer switch has had a loud humm to it since new--in fact was replaced under warranty once to no avail. Unfortunately it sits near our bed, so it's bothersome at night. my RV tech says I cou...
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We also have a PD transfer switch under our bed. It is sometimes loud. But this year it got really annoying. So we opened cover of switch up, and discovered that we can decrease the loud hum, by stuffing a small wedge inside between the casing & actual switch block inside. This wedge tightens the entire switch block inside, thus eliminating noisy hum. We stuffed the wedge at different points while it was humming, until we found the exact point & pressure, on ours, it was the shore power side of switch inside, that hummed.
