Florida generator guide

Generac Fault Code 2299 (Overload at Startup): Why It Trips the Instant the Load Hits

Code 2299 isn't your generator dying in the middle of a run. It's the generator firing up, the house reaching over and grabbing a full load in the first second, and the engine faceplanting before it ever got to speed. Generac's own definition: the unit tried to start with a large load already connected, and it couldn't ramp its output up to normal with all that weight hanging on it. In Florida, the thing hanging on it is almost always your air conditioning.

Get your address-specific installed price →

About five minutes. No salesman, no all-day window.

What 2299 is actually telling you

Most overload codes — the 2100 through 2103 family, "Overload Remove Load" — happen while the generator is already running and something pushes it past its limit. 2299 is different. It's a startup fault. The engine cranked, caught, and in the moment it tried to spin up to clean 240-volt power, a big load was already sitting on the other side of the transfer switch waiting for it.

A generator makes good power by holding its engine at a steady RPM. That's what sets the frequency at 60 Hz. When a heavy load slams on before the engine is up to speed and stable, the RPM sags, the frequency drops below what the controller will accept, and the controller pulls the plug rather than feed your house dirty, sagging power. From the outside it looks like the generator started and instantly quit. What really happened is it refused to close into a load it couldn't carry cleanly.

This is why 2299 almost only shows up during an actual outage, when the transfer switch is still handed over to the generator and the whole house is standing there with its hand out.

Why Florida homes trip it in the first second

An air conditioner does not sip power when it turns on. The compressor's inrush — locked-rotor amps — is roughly five to seven times its normal running draw for a fraction of a second. A 4-ton central unit that hums along at maybe 20 amps can spike well past 100 amps at the instant the compressor kicks. That spike is the surge that 2299 is complaining about.

Now picture a Florida outage. Power blinks off at 3 p.m. in August. The thermostat was already calling for cooling, so the AC contactor is closed and waiting. The generator starts, the transfer switch throws to generator power, and the compressor tries to inrush at the exact same moment the engine is trying to reach speed. Two big demands, same half-second. If the generator is even slightly undersized for that combined hit — and air-cooled units on homes with big or multiple AC systems often are — the engine bogs, frequency craters, and the controller throws 2299 before you've finished walking to the window.

Stack a second AC zone, a pool pump, a well pump, or an electric water heater on top of that startup moment and a unit that tested fine on a cool day in the driveway can trip every single time the real Florida load hits it.

How to get it running again — and how to make it stop

During the outage, the fix in the moment is to take the load off the generator's back while it starts. On most installs there's a main breaker inside the generator enclosure or behind the gray panel on the side. Turn that breaker off, let the generator start and settle to a steady, healthy sound, then close the breaker to hand the house its power a moment later — after the engine already has its legs under it. If it still struggles when the load comes on, start shutting things off inside until it holds.

To clear the alarm itself so the unit will run and transfer normally again: turn the controller to OFF, then press ENTER twice. When the screen reads SWITCHED TO OFF, the code is cleared and you can put it back to AUTO. If it faults right back to 2299 the next time the AC calls, that's not a fluke — it's telling you the load and the generator don't match.

The permanent fix is load management. A Generac Load Manager (formerly the Smart Management Module, or SMM) sits on a heavy circuit like your AC and manages that inrush at startup — it holds the big load off for a beat while the generator gets to speed, then lets it on, and it sheds that load again if the frequency ever sags under load. Prioritize the ACs and other big motors and the generator stops getting hit with everything at once. The other permanent fix is simpler and blunter: the generator was too small for the house, and it needs to be sized for the real startup load, not the running numbers on a spec sheet.

One number for your actual house, not a spec-sheet guess

Here's the thing 2299 exposes: this is a sizing conversation, and sizing off a brochure is how homes end up with a generator that faults every time the AC kicks. Your startup load depends on how many tons of cooling you run, whether you've got one air handler or two, the pool pump, the well pump, the water heater, and how much of it wants to come on at the same instant the power fails.

GENERasic sizes to that — your address, your panel, your AC tonnage, your setback and gas run — and comes back with one committed installed price. Not a range, not a "starting at," not a number that grows after the site visit. One number, the unit correctly sized so it carries your Florida load in that first second instead of faceplanting into a 2299. Tell us your address and what you're running, and that's the number you get.

Common questions

My power went out and the generator runs fine, but the second my AC clicks on it shuts right down. Is that this code?

That's exactly the pattern 2299 describes — the generator can carry the base load but the AC compressor's startup surge pushes it past what it can hold, the frequency sags, and the controller drops out. Check the controller screen for the code. The real answer is almost always load management on the AC circuit or a generator sized for that inrush, not just the running watts.

Do I have to flip the breaker in the transfer switch before I restart it, or just the one on the generator?

To get running again in the moment, the breaker that matters is the main inside the generator enclosure (or behind the gray side panel) — turn that off so the unit starts with no load, let it settle, then close it. You don't need to touch the transfer switch to do that. Follow whatever your unit's manual specifies for your model, since setups vary.

The power came back on and I want to clear this alarm — how do I reset it?

Turn the controller to OFF, then press ENTER twice. When the display reads SWITCHED TO OFF, the alarm is cleared and you can set it back to AUTO. If it faults to 2299 again the next time the AC calls for cooling, the code isn't the problem — the generator is undersized or unmanaged for your load, and clearing it won't stop it from coming back.

Will adding a load manager or smart module actually fix this, or is that just a band-aid?

A Load Manager (SMM) genuinely helps when the generator is close but getting overwhelmed by everything starting at once — it staggers the big loads so the engine reaches speed before the AC inrush hits, and sheds load if things sag. But if the generator is simply too small for the house's real startup demand, a load manager only delays the problem. The right move is to size the unit correctly and use load management to smooth the surge, not to lean on the module to rescue an undersized generator.

When I come back after the outage the power's already on — do I just do the shutdown steps in reverse?

If utility power has returned, the transfer switch will hand the house back to the grid on its own once the generator is off and the system is in AUTO. Get the generator off and back to AUTO per your manual, and it'll be ready for the next outage. The thing to sort out before that next outage is why it faulted in the first place, so it doesn't repeat when you actually need it.

Stop reading ranges. Get your number.

GENERasic pulls the real property, flood, and elevation data for your exact address and returns one all-in installed price — sized to your home, your fuel, and your flood elevation. The vetted local installer confirms it on site.

Get your installed price →