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We have a generac 20k generator and auto transfer switch. It has worked well for 3 years, but now when the power goes out it only switches over half the house. Any suggestions on troubleshooting would be very appreciated.

  • Hello, and welcome to Home Improvement. Is this a 240VAC dual phase generator? Would you post a diagram of the wiring? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Aug 9 at 0:26
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    What is the manufacturer and model of the transfer switch? – A. I. Breveleri Aug 9 at 0:29
  • What country and state or province is the house in? – A. I. Breveleri Aug 9 at 0:30
  • Is this transfer switch a service entrance type (i.e. ahead of the main panel?) – ThreePhaseEel Aug 9 at 1:15
  • What ever it is you have lost either 1 leg of the generator or 1 leg of the transfer switch. Voltage measurements at the generator output and transfer switch need to be made. It can be a bad connection a bad breaker or transfer switch connection. More info is needed to help further. – Ed Beal Aug 10 at 2:12

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