We have not linked an official manual for this model yet; see the GenMax page.
Error codes and troubleshooting
We have not found an official code table for this model yet.
FAQ
Can the GenMax GM9000iED start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 9000 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.