Question about Watts Onan Portable Generator - 4000 , Model# 5500

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How to correct over crank fault??

Fault lite blinks & generator will not crank, How to clear? What causes it to fault in the 1st place

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Over crank is failure to start, check fuel and ignition, why it isnt starting

Posted on Mar 01, 2015

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Posted on Jan 02, 2017

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SOURCE: rv generator output, yet no power in coach. Called

Check to see if you have power going into the switch. This can be done with a voltage meter at the terminals were the cable runs into the transfer switch. Do you have power at the generator plug?

Posted on Jan 15, 2010

  • 395 Answers

SOURCE: Have Onan 3.6 KY propane

I am not familiar with your peice of equipment but from your description of the fault being Under Frequency it appears that generator governor is out of adjustment or the governor spring has brcome weak or broken and not allowing the engine to run at the correct speed to produce an output frequency within the allowable tolerance. Governor linkage could also be binding and not moving smoothly to respond properly to engine load conditions. Thoroughly check governor and throttle linkage for free and smooth operation and full range of movement.
Another cause could be that the engine is not getting sufficient fuel causing the governor to have the throttle wide open to try to get engine to run at its correctly governed speed but unable to do so because the engine is not developing enough horse power.

Posted on Jan 10, 2011

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1 Answer

When serviced it showed a low frequency fault but after service it cleared the fault. What is possible causes for fault?


Low frequency is caused by the engine not running at it's correct speed. There is a governor mechanism that controls the engine speed, so I'd check it for proper operation.

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1 Answer

How to clear check engine light


You need a scan tool to clear codes.

But doing this is a pointless exercise as the CE warning light will come back next time you drive the vehicle unless you deal with the problems that are generating the fault codes and CE in the first place.

If you have replaced parts (because some one told you XYZ fault code = replace ABC part) you thought were causing the problems and you are still getting the CE and fault codes then your diagnosis of the problem was completely wrong.

Jan 09, 2016 | 1999 Jeep Grand Cherokee

2 Answers

What does it mean when check engine light is flashing


get it serviced USUALLY before it blows up

Nov 21, 2015 | Cars & Trucks

1 Answer

What is Code 33 on Onan Generator Model12.5 HDKCB11506B?


You may be reading the code wrong, Code 33 shows up as blink 3 pause blink 3. This means it has a lower level code fault. To access the real code. Press the stop button 3 times fast within 5 seconds and re-post what the code is please. It may blink pause then blink again, that is the lower fault code that will help diagnose the problem.

Feb 10, 2015 | Onan Generator, 4000W, Gasoline

1 Answer

How to clear the code fault on my Onan 4000 generator. What causes a fault & why???


what model is it KY KV need that and Spec. If it blinks 3 times it indicates a lower service fault. While blinking hit the stop button 3 times fast, then read the code. It will blink, pause then blink again and repeat. What is that code and I can help you. IE 4 blinks pause and 3 indicates code 43

Nov 13, 2014 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Kohler 12.5 res gen. Battery is good. Get OC code. If I reset auto switch by clicking off, then clicking run, then clicking auto it will start. Any thoughts on this issue?


OC is Over Crank which generally means it cranked and cranked and failed to start. Turning the switch off and on again is the way to clear the fault. How long is it taking to start whilst cranking? It should start within 8 seconds

Sep 11, 2013 | Kohler Electrical Supplies

1 Answer

How to fix over speed fault in desiel generator?


On the flywheel is a small sensor you should see it, like a threaded bolt with wires, that goes into the housing. This is the mag pickup speed sensor, it can get metal filings on it causing this fault. Unscrew it and wipe it off, screw it CAREFULLY all the way down with your fingers until it touches the flywheel then back out one turn, it is a small gap. Crank engine and measure the voltage on the sensor wires will be approx 2 VAC if it is working, if not replace sensor

Aug 27, 2012 | Taylor Mobile Generator Set 80 kW, 480...

1 Answer

I have a locked rotor fault message.


I had this fault show this morning. Very alarming, as we have a typhoon coming theough tomorrow!

Turned out to be an easy fix. When I hit start the solenoid engaged but nothing moved. Then I saw the fault message and thought "Large $$$$!"

It was just a bad 12 Volt battery, and when it couldn't crank it threw the fault code. I replaced the battery, pulled the 3 fuses on the control panel (mine is the 20 Kw model), and the codes cleared, and she fired right up.

The advice here and on a couple other sites about powering down the panel to clear fault codes saved me a lot of time, money and aggravaion, not to mention a freezer full of food (knowing the Guam Power Authority, and knowing typhoons, the power WILL go down tomorrow.

Jul 27, 2012 | Kohler 14resa 14kw Home Emergency Backup...

1 Answer

Generac 20,000kW Standby generator doesn't start shows message STOP ALARM OVERCRANKED


Overcrank means that it tried to start and couldn't. It will go through 5 crank cycles and then stop with this alarm. Switch to off, hit enter to clear fault and then try to start in manual. Check to make sure you have fuel and pressure is 11 to 14 in WC.

Jun 21, 2012 | Generac 13,000 Watt / 13,000 Watt Home...

1 Answer

Have Onan 3.6 KY propane gen that will not keep running. Runs only as long as start switch is pushed. Then stops immediately after release. Fault code is 15 (underfrequency) and suggests removing heavy...


I am not familiar with your peice of equipment but from your description of the fault being Under Frequency it appears that generator governor is out of adjustment or the governor spring has brcome weak or broken and not allowing the engine to run at the correct speed to produce an output frequency within the allowable tolerance. Governor linkage could also be binding and not moving smoothly to respond properly to engine load conditions. Thoroughly check governor and throttle linkage for free and smooth operation and full range of movement.
Another cause could be that the engine is not getting sufficient fuel causing the governor to have the throttle wide open to try to get engine to run at its correctly governed speed but unable to do so because the engine is not developing enough horse power.

Jan 10, 2011 | Watts Onan Portable Generator - 4000 ,...

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