Generac PWRcell › Problems
Generac PWRcell inverter shows State 0x7721
A Generac PWRcell inverter shows the fault code State 0x7721. This page covers what the code means, what to check first, and the cause behind it.
Error codes that go with this problem
| Code | What it means |
|---|---|
| State 0x7721 on the inverter | The inverter is not set up for an automatic transfer switch (ATS), but it has detected one. |
What to check first
- Note the code as the inverter's device page shows it, State 0x7721, for your installer.
- Call Generac phone support with the code. The wait can be long, but support was able to find the problem for an owner who had this code.
The causes and the fixes
Partners see the causes behind this problem, most common first, the checks that tell them apart, and the fix for each, with part numbers and recent prices when a part is involved.