Controller displays “Air Filter” or “Restricted Air Filter”; engine may run rich or lack power.

Safety first: Turn generator OFF and open main breaker.

• Inspect filter: Open the air filter housing on the Kohler engine. Remove the filter element and inspect for heavy dirt, oil, or damage.
• Replace filter: Install a new Kohler-approved air filter if the old one is dirty. Do not attempt to blow out paper elements with high-pressure air as it can damage them.
• Clean intake path: Check intake ducts and louvers for obstructions and clean as needed.
• Reset alarm: Clear the air filter alarm on the controller and run a test cycle.

Regular air filter replacement is critical for proper engine performance and longevity.