Question about Generac Guardian Series 8 kW Air-cooled Automatic Standby Generator

Open Question

Generator shuts down with overspeed alarm

Generator shuts down with over speed indication

Posted by on


2 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 6468 Answers

SOURCE: I have a 16Kw generac generator. The unit starts then the engine overspeeds but does not shutdown. The engine starts to exhaust white smoke. I shut it down after only a matter of 2 or 3 seconds for fe

smell the oil to see if it smells like fuel f so the carb needle valve may not be seating

Posted on Aug 18, 2012


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do you fix generator from going into overspeed?

you have a stepper motor issue. thats why its overspeeding

Nov 13, 2017 | Electrical Supplies

1 Answer

Sir, I had a problem with my 1000kVa diesel engine generator whereby it had tripped on overspeed alarm. After 10 days , fuel injectors got damaged in diesel generator. What is problem & Why fuel injector...

The injectors probably were damaged because the unti ran away, it should have shut down on over speed. If it did not then the sensor and control need checking. I would also check the engine oil to see if diesel has found its way into the sump. If it has then the rings are shot and the unit is "self feeding" off it's own engine oil, and no control signal will shut it down, it needs checking out by a pro, as a runanway diesel is extrememly dangerous in the size you are speaking !

Sep 19, 2013 | Electrical Supplies

1 Answer

Generac Guardian 12 KW Model 04456-2 shuts down on overspeed in cold weather

See my 5/22/12 comments on my "overspeed fault" problem resolution [Generac 43903 standby Generator overspeed indicator on starting] . If it only runs for a few seconds and then quits, you may have a similar condition to the one my unit had. A good technician should be able to diagnose the problem and determine if you have a similar failure to the one I had, or one of the other causes suggested by RSG000.

Jan 20, 2012 | Generac 13,000 Watt / 13,000 Watt Home...

1 Answer

Generac 15000 portable generator: during use the motor revs extremely high and then shut off occasionally.

The reason its shutting down, is probably because its going in to overspeed and the safties are shutting it down to protect the engine. is it doing it under a load or no load.

Aug 13, 2011 | Generac Electrical Supplies

1 Answer

I have a generac 22kw model QT02224anan that will run for a few minutes then shut down , then the over speed led is lit. It only happens when it is under load or during a power outage. it goes through...

its possible the overspeed is set to sensitive. or your rpm are to high. these are preset in the factory as a safety, check your manual to ensure your rpm speed is in the pre set area. generators will do this under load when you have a big load on them or take a load off. the governor will some times over compensate causing it to trip on overspeed.

Aug 10, 2011 | Generac Power Systems Generac QT02224 22...

1 Answer

My 20Kva Generac generator run for about 30 minutes and automaticly shut off. The alarm indicated that the generator has over speed. I don't know where to adjust or set the right hz.

The speed should be such that 60 Hz is generated when under load.

The govenor MAY be out of adjustment.

The speed for 60 Hz should be one of the following:

3600, 1800, 900 RPM

May 07, 2010 | Electrical Supplies

1 Answer

10kw Generac shut down overspeed

Make sure that the throttle linkage is all there and not damaged/misadjusted, then get a manometer and check your inlet gas pressure. Gas pressure should be 8 inches of water column and stay there running or not.


Apr 06, 2009 | Guardian Electrical Supplies

2 Answers

Generac Guardian 15 kw overspeed fault

Did you remember to set the overspeed shutdown threshold on the control board?

Apr 03, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

1 Answer

Engine overspeed light blinking

Hi there,
You probably have a broken magnetic pickup.
You'll have to reset the generator controller, usually this is just a matter of turning the switch of the off position. On most of the generators I've worked on a blinking overspeed light as opposed to a solid one means that the control board can't detect any speed input. Speed input can be either a wire that comes from the generator output, or a magnetic pickup mounted so that it can count flywheel teeth. You don't say which generator this is so I can't guess any better than that.

Dec 30, 2008 | Electrical Supplies

Not finding what you are looking for?
Generac Guardian Series 8 kW Air-cooled Automatic Standby Generator Logo

Related Topics:

50 people viewed this question

Ask a Question

Usually answered in minutes!

Top Generac Electrical Supplies Experts

Craig Butler
Craig Butler

Level 3 Expert

1723 Answers


Level 2 Expert

80 Answers

Don  Farrell
Don Farrell

Level 3 Expert

1018 Answers

Are you a Generac Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides