Why Didn't My Automatic Transfer Switch (ATS) Turn On?

This article provides troubleshooting tips when a Generac generator starts up during a power outage, but the automatic transfer switch (ATS) does not transfer power over automatically. The causes of the issue could be due to various factors, and the article suggests several resolutions to the problem, including switching on the main line circuit breaker, checking the control wires, performing a manual transfer, or reaching out to an Independent Authorized Service Dealer for assistance.

  • Jun 23, 2025
  • Knowledge

Title
Why Didn't My Automatic Transfer Switch (ATS) Turn On?
URL Name
Why-Didn-t-My-Automatic-Transfer-Switch-ATS-Turn-On

Public Answer

Read the manual thoroughly and understand all of the instructions, cautions, and warnings before using this equipment. If any section of the manual is not understood, contact your nearest authorized dealer, or contact Generac Customer Service at 1-888-436-3722 (1-888-GENERAC), or www.generac.com with any questions or concerns. 

Automatic transfer switch does not activate during an outage

Home standby generator systems with an automatic transfer switch (ATS) should automatically transfer power to the generator when an outage is detected. 

The ATS requires two things to transfer power automatically: Voltage available from the generator and voltage on the transfer circuit (194/23 wires).

If power transfer to the generator does not occur after an outage, reference this article with comprehensive guidance on resolving power transfer issues: Troubleshooting Automatic transfer switch issues

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