) is the "brain" behind the machine. Whether you're troubleshooting a "Start Fail" alarm or trying to unlock the "Engineer Mode" for deeper configuration, having the right guide is essential. Quick Guide to the Pramac AC03 Controller AC03 controller
Visit the official Pramac (Generac Group) support portal. Navigate to “Support” > “Manuals and Documents.” Use the model search filter. Enter your specific generator model (e.g., Pramac S5000, GBW 65, etc.) rather than just “AC03,” as the manual is typically bundled with the generator’s technical documentation. If located, you will download a ZIP file containing the AC03 manual alongside the engine manual.
Once you download the manual:
One of the most valuable pages in the is the terminal connection diagram. Here is a quick reference to common terminal blocks referenced in the manual:
Press and hold the Menu button for 4 seconds. The display will show “Cancel Changes?”. Press Enter to abort. The manual warns that power cycling while inside a parameter screen can corrupt the EEPROM.
The AC03 distinguishes between warnings (flashing light, genset continues) and shutdowns (solid red light, engine stops). The manual includes a full fault code table:
Pramac released three major hardware revisions of the AC03 (v1.0, v2.1, v3.0). The v2.1 and v3.0 added configurable relay logic and an expanded fault history log. The manual PDF’s cover page will indicate the applicable firmware range. Always match the revision.
) is the "brain" behind the machine. Whether you're troubleshooting a "Start Fail" alarm or trying to unlock the "Engineer Mode" for deeper configuration, having the right guide is essential. Quick Guide to the Pramac AC03 Controller AC03 controller
Visit the official Pramac (Generac Group) support portal. Navigate to “Support” > “Manuals and Documents.” Use the model search filter. Enter your specific generator model (e.g., Pramac S5000, GBW 65, etc.) rather than just “AC03,” as the manual is typically bundled with the generator’s technical documentation. If located, you will download a ZIP file containing the AC03 manual alongside the engine manual.
Once you download the manual:
One of the most valuable pages in the is the terminal connection diagram. Here is a quick reference to common terminal blocks referenced in the manual:
Press and hold the Menu button for 4 seconds. The display will show “Cancel Changes?”. Press Enter to abort. The manual warns that power cycling while inside a parameter screen can corrupt the EEPROM.
The AC03 distinguishes between warnings (flashing light, genset continues) and shutdowns (solid red light, engine stops). The manual includes a full fault code table:
Pramac released three major hardware revisions of the AC03 (v1.0, v2.1, v3.0). The v2.1 and v3.0 added configurable relay logic and an expanded fault history log. The manual PDF’s cover page will indicate the applicable firmware range. Always match the revision.
