As with many other RV owners the Progressive Dynamics PD52 transfer switch quit working. The dealer where I purchased the unit said that this was a common problem with this switch and that Keystone severed their contract for this particular switch. He also said that he would recommend an upgrade. I was credited for the labor and the price of the PD52 transfer switch, but I had to pay for the price difference between the old and new units. I had a Surge Guard 40350RVC3 unit installed as a replacement. So far no issues since the repair and replacement.
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