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.
Charger missing AC code 2780
Home standby generator control panels may display the Charger Missing AC Code 2780 alarm code when there is an issue with the voltage at the T1 wire.
Warning: Generac does NOT recommend end users attempt to modify or service internal generator wiring or attempt to service the transfer switch: How Can I Find a Generac Service Dealer in My Area?
Generac-authorized service dealers are trained to resolve these issues and can be contacted using the dealer lookup tool on Generac.com.
Environment
This error can occur on Generac home standby generators that feature an Evolution 1 or Evolution 2 display.
Cause
This error indicates that the T1 wire is not receiving 120 VAC. This could be due an issue with the T1 wire, or the T1 fuse.
Resolution
- Using a multimeter, a qualified technician can check to confirm the voltage received on the T1 wire. It should be receiving 120 VAC.
- Additionally, a qualified technician can inspect the T1 fuse inside the transfer switch to see if it has blown. If it is blown, a qualified technician can replaces it using the supplied fuse puller: How Can I Find a Generac Service Dealer in My Area?
If the Charger Missing AC Code 2780 does not clear from the generator's control panel, the issue is not resolved. When the issue is resolved, the code will clear automatically.
See also
