Controller displays OL and generator shuts down when loads are applied.

Safety first: Turn OFF the generator main breaker and the utility main breaker before touching any wiring. Only qualified persons should open electrical panels.

• Reduce load: Turn off large loads (HVAC, electric water heater, range) at their breakers. Restart the generator in MANUAL with the generator breaker OFF, then slowly re-energize loads one at a time.
• Isolate the problem circuit: If the OL fault appears when a specific branch breaker is turned on, leave that circuit off and have an electrician inspect for shorts or ground faults.
• Inspect ATS: With power off, visually inspect the Briggs & Stratton automatic transfer switch for signs of overheating, melted insulation, or welded contacts. If found, the ATS contactor assembly may need replacement.
• Check load-shed modules: If your system uses Briggs & Stratton load control modules, temporarily disconnect their low-voltage control harness from the controller and test again. A failed module can cause abnormal loading.
• Clear the code: After correcting the load issue, place the controller in OFF for 30 seconds, then back to AUTO. Start in MANUAL and verify the generator carries load without tripping OL.