An automatic standby generator should not be operating if/when utility power is available; the generator is manufactured to automatically operate and provide backup power when a power outage occurs. If your unit is operating when utility power is present, we would recommend having your unit's connections checked immediately by a local independent authorized dealer. To locate an independent authorized dealer closest to you, please use your postal code for searching purposes here: http://www.generac.com/dealer-locat...
Also, an Underspeed alarm will show when the engine is not able to increase speed and run at 3600 RPM. There can be many causes for this, including, but not limited to, low fuel pressure, bad spark, the unit becoming overloaded, or the unit’s battery being low or dead. We would first recommend verifying the voltage of the battery and replacing it, if need-be. If the unit’s battery is fine, we would then recommend contacting your gas line installer to ensure that the fuel pressure is proper. If the fuel supplied to the unit is adequate, then we would recommend contacting a local independent authorized service provider for any diagnostic and/or servicing work that may be required. We recommend contacting your gas line installer first, as ensuring correct fuel pressure is the first step in the troubleshooting process, and if applicable, would fall under improper installation under the warranty statement.
If you have any other product-related comments, questions, or concerns, please contact us directly at 888-GENERAC (436-3722). We hope you find this information to be helpful.