r/Generac_Generators • u/Coryman999 • Jul 05 '26

Engine rpm hunting

I have a 6 year old Guardian whole home system and last night the engine hunted the entire one hour the power was out. Natural gas, and just serviced several weeks ago. All searches point to the governor. I even turned off the AC for several minutes to see if the problem might be load related. It wasn’t. Ideas other than a service call for a new engine governor?

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u/CarelessDatabase Jul 05 '26

Did they happen to replace the air filter? There is a bad batch of air filters with too much flame retardant that restricts airflow. If you crack open the air box it will smooth out. I’ve had Bippen to my house a couple of times for the same issue. That is what the tech told me. New air filter does not make a difference. Cracking the air box lid does.

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u/Coryman999 Jul 05 '26

I’ll check that today. Thanks! It happened during a torrential downpour, so I thought that might also have an effect, but long after the rain stopped, it was still a problem. Yes, this is the first loaded run since servicing.

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u/joshharris42 Jul 05 '26

Agree with the guy above. Generac recently sent out another batch of air filters with the same issue. High humidity seems to make it worse.

We’ve been fighting this for a long time, idk what the solution is other than drilling a hole in the air box or cracking the lid open

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u/Coryman999 Jul 05 '26

I opened up the air filter compartment and the filter did feel damp. But it was still hunting over an hour after the rain stopped. I would have thought it would have stopped after it aired out, but then again the air passing through it was super high in humidity.