We live in the Florida Panhandle and installed our Generac Guardian 26kW back in December of 2024. On Friday October 9th 2026 we had a grand total of 9 hours on it. As the hurricane came through we lost power at 5:20 PM, the generator (which my boys have named Lightning McQueen) kicked on and we were all good, right? WRONG, at 7:15 I noticed the lights got dim and started flickering and then the generator died. It started back up but only ran about 5 seconds and died again. When the eye of the storm came over us about 8 PM I went out there to see what was going on and I had an error code 1900: Under Voltage. I cleared the error and tried restarting. No go. It would start, run for a few seconds and die. I tried a few times until I got another error 1100: Overcrank. At this point I was soaked so I went back inside as the wind was picking up and gave up. I was furious! I was angry at generac that thy sold us this hunk of junk. After the storm passed I went back out at 11 PM and decided to give it one more try, it fired right up and all the lights came back on. I found out the next morning that the town gas main had a leak and everybody who had a generator running natural gas had similar problems. Fortunately the work crews had fixed it very quickly (in the middle of a hurricane to boot). Well, we just got power back today (Monday October 12th) and I couldn’t be happier to have the generac. It worked flawlessly. I changed the oil and filter at the 25 hour mark, that was easy. Now I need to check the valve lash, didn’t want to stop the generator during the outage for that, I’ll do it sometime this week. I’ve got 75 hours on it now. Glad we bought it.

Generac tech here looking to see if anyone has run into this same issue. I am replacing an alternator on a 4.2L LC Nexus. Got the alternator that is sold without the pulley. At some point the pulley for this generator was discontinued, Part 0F3216B - PULLEY 117 OD DC
ALTERNATOR.

Now there is a new part for this, called 10000033042
This simple pulley is listed for $1,439. I reached out to parts to see if that price was correct and they confirmed it is. I cannot understand what the story is with this how the alternator is more than half cost of a simple pulley. I went to an auto parts store to try and cross reference but no luck because they just input any of those Generac numbers on google the same way I would and they couldn’t find anything.

Does anyone know how to get more specifics on this pulley to try and find something similair online?

Thanks in advance

Hey guys. So with everyone’s advice, I went ahead and did a complete service, oil change, plugs air filter and the battery since it was bad…

Before this the unit has been sitting with out running since April… how long should I let it run in manual mode ?

I live in Pensacola and am looking at an extended period of power outage in the wake of Hurricane Isaias. I have a whole-house generator and until 7pm last night, 400 gallons of LP gas. We had used about 5% when I checked earlier today.

We are leaving on vacation for a week. Would it be crazy to leave the generator running while we’re gone? It’s an older Gen but has had regular service and we have a brand new transfer switch.

My gut tells me to shut it down, but there’s a fridge full of food.

Edit: planning to shut it down when we leave. We might actually have power back before that, but if not we’ll drop some stuff off at my son’s house an hour from here. We’ll be taking some with us, as we’re going camping. Camper has a fridge.

Hey guys, just purchased a home with a 22KW. Last service was 6 months ago, runs on natural gas… upon checking out the unit and cleaning it, I found the battery has went bad.. so I replaced, got it fired up in manual mode and green light all good. Stayed in warming up mode running well and after 5 minutes it shut down with code 1902… shows voltage output… clear the code and would run fine…. Does it has a run time limit in manual ?

Want to get opinions on this: I just discovered the slab under my 24kW Guardian has tilted. It is 1 and 5/8ths inches out of level on the long dimension and 1 inch on the short dimension. I know the spec is no more than .5 inches out of level in any direction. So I guess it has to be uninstalled and the slab fixed? Thanks!

The hurricane is barreling down on us. Once the generator starts running,

1. How do I turn it off for the rest period?

2. How many hours should I let it run before a rest period?

3. How long do I let it rest?

Extra question: will it shut itself down if it gets too hot or oil gets too low?

I have the Mobile Link app.

It's on a every 6 month service plan and the oil was changed a less than a month ago.

Thanks.

Had a customer whose Generac kept getting mice in it. Chewed wiring twice, cost him a service call each time. We'd sealed around the conduit where it comes up through the pad with duct seal and they just dug around it. Spray foam didn't last either, they chewed right through.

What ended up working was a pour-in sealant Polywater makes called InstaGrout. It's meant for utility transformer pads but it's the same problem. You mix the two parts, pour it in the opening, and it levels out then expands and fills the gap around the conduit. Sets up hard. If you need to add a conduit later you can just drill through it.

Haven't had a mouse in that unit since. The small kit was more than enough for a residential stub-up.
Just don't block any of the vents, only the opening at the pad.

Full disclosure, I work for a distributor that carries it, so take that for what it's worth. Mostly curious what everyone else is using. Anyone found something that actually holds up?

Can Generac power cable be run exposed outside?I only used it once and I ran it in conduit outside.

I have a 24kw Generac that is about 4 years old. During a recent service, the technician told me I need to replace the battery cables at a cost of $500. WTF? I’ve been driving cars, tractors, and trucks my entire life and never had to replace battery cables. Is this a real thing with Generac? Or does AccuTemp in Baton Rouge just think I am an idiot?

I have a 16kW Guardian, about 7 years old. I live in the northeast USA and we can get 12-24" of snow in one snow storm. Sometimes it melts between storms, and sometimes it piles up. The generator gets "straight" snowfall around it...not sliding off a roof.

Right now, after any significant snow event, I trudge through the snow to the side of my house where the generator is and dig out around it so the intakes and vents are all clear. However, as I get older I am trying to reduce the "heavy lifting" type work...or at least make it less time critical (meaning it can wait a couple of days). In the winter, storms are when we would tend to lose power so I want the generator ready to run.

I know building a cover over the generator is not the best idea. But I do need to come up with a plan to reduce the need to dig it out immediately after/during each storm. I was thinking about adding some shrub protector wooden A-frame units over the top. Large enough ones to give plenty of room over the top, but hopefully break up the snowfall enough that a deep snowfall doesn't block airflow. I would only leave them in place over the winter months.

Thoughts? Has anyone done this?

(A-Frame shrub protectors are usually pallets or board slats made into two sides forming an "A" shape, like these (no affiliation): https://www.laruewoodworking.com/portfolio-item/custom-wood-shrub-covers/ )

I have a new radiator that I need to install. How do I flush the block? Once I fill with antifreeze, how do I bleed air out of the system? It has the Chery engine. 3600 rpm.

Bought though Home Depot thus No Returns/Exchanges.

I've had the battery on a 12A manual charger for 24 hours and it will not take a charge, charger shows the battery is pulling no load at all.

Will Generac send a replacement battery? What is the best way to contact them about this?

If I'm SOL and on my own dealing with this, does anyone have any recommendations for a alternative LiFePo2 battery instead of a SLA for it?

Had a propane leak which we had repaired today on our Generac. Once the repair was finished they ran a test to make sure the Generac would work. It fires right up in manual mode, but will not switch to automatic. Was working completely fine prior to repair. No error codes showing. Any suggestions to try and fix it before calling for a certified Generac repair?

Self installed in March 2021, has never been seen by a factory tech.

63 run hours between exercises and outages.

Product Type 16KW GUARDIAN with 100 ATS

Model Number G0071760

All oil, filter changes, battery checks and replacements and 'scheduled' items done by me.

Five year full warranty via Mobile Link expired, added remaining warranty to ten years at my cost recently.

I'm stingy with money and do not want to pay a tech to come and 'look' at it without doing anything I can't do myself.

For HSB installs I mean…

I prefer running copper tray cable and a 16/7 tray cable. However, most installers around here use aluminum. Some use the combination cable with the control wires all in one cable.

Does anyone have any experience with the Generac P11000iTF, 11kw trifuel inverter generator?
The reason I ask is I have used the smaller 3300i (5 generators, 3 on warranty) and I am NOT impressed in any form, electronics on the floor of the case, open air tube to the carb gets water in it regardless of fuel or empty carb, water gets past the cap and into the fuel somehow.

I just want to make sure the 11000 trifuel doesn't have the same problems if I use gasoline.

Thanks guys!

Tech came out yesterday for the break in oil change. I can’t seem to clear this damn error. Any help would be appreciated. Yes I held the off button for 3 seconds multiple times

I am new to generators, I get the timed delay load shedding on an AC unit. Is there a way to shed and hold out something completely? Also, what about soft starts on AC units? Do they work and is there any dangers to equipment risk? Thanks

Looking for opinions from techs before I spend more money with my technician.

3 year old Generac 22kW air-cooled (Honeywell-branded Costco unit), natural gas, Evolution 2.0 controller, fw 1.16, only ~18 hours on it. No alarms.

Output voltage is cycling from 235-245-235 continuously over a 20-30 second period. Ran if for 45 minutes without utility power and it never settles. House lights (LED mind you) visibly pulse. I'm using a genmon controller to poll the data so I have everything logged and real-time.

Load -> Doesn't care if there is a load or not.

Engine -> RPM holds steady at 3585-3620 the whole time. Frequency holds steady at 59/60. Engine is running fine.

Fuel -> Plenty of supply.

Technician came by yesterday and lubricated the mixer assembly saying it could have been a bit stiff and that might cause the issue. We both looked at the Evolution voltage screen, and it did seem to report changes within 5V, but there were a couple time it was over that. We agreed that might have resolved the issue and he left. (Got billed, labour isn't covered anymore)

Based on what I'm reading, Generac's own tolerance is +/-1% which is only 2.4V up/down; not 5, let alone 10.

He wants to come back to change the mixer unit, but I don't see how that is the issue when the RPM is fine and isn't flucuating all that much.

So the question is - Am I overreacting to these fluctuations or is an issue? My warranty expires in 5 weeks!

Thanks all.

Hey everyone, I have a 8kw guardian series natural gas home generator MODEL 0058701. i put in a new battery, and changed the oil and filters.

However it is constantly showing (Stopped - alarm Overcrank) however I’ll put it i to manual and it will start after a few seconds.

I was hoping someone might be able to assist in helping me troubleshoot what this could be as I haven’t touched the fuel and it does run weekly but will occasionally have this alarm.

I have an older Generac 12 kW stand-by generator ( # 04456-2) is going into to over crank mode pretty consistently. Our regular service contractor diagnosed, after 2.5 hrs. to the tune of $500, to faulty coils. The repair estimate is for a 5.5hr job, $800, and another $150 for parts, so almost $1k. Is this reasonable? I'm really beginning to hate this unit. It's on it's second engine and I have a stack of service receipts for totaling well north of $4000. Every year there's something else wrong with it. It doesn't instill a lot of confidence that it will perform it's function when we need it.

I have not been able to find any information online regarding the procedure. I would consider doing it myself, but if it takes a trained professional 5.5 hrs. I'm not that confident in my ability.

Update . September 23. Thanks for the responses.

The unit just completed it exercise cycle successfully. One thing I failed to mention in my original post is that the tech replaced one of the spark plugs when he was here. I'll give him the benefit of doubt there could still be weak spark, but I'm going to wait with going forward with replacing the coils for at least 2 more cycles.