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

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

My Generator will not crank & code fault light blinks. I don't know what happened to cause this or how to fix it!!

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  • 573 Answers

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

Posted on Mar 01, 2015

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Posted on Jan 02, 2017

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SOURCE: Onan 4000 RV Generator - where is the oil drain plug?

It should have a cover on the floor bottom that is held in place with two torx (star) screws. remove the cover and you can remove the plug with a 9/16 socket.

Posted on Dec 02, 2008

joboo1
  • 257 Answers

SOURCE: onan microlite 4000 generator no output

Hi, The 4000 rv unit unit is equipped with full diagnostics, and is indicated by the status light blinking. The blinking sequence, blinks a code as to the fault. If your unit runs and the status light is on without blinking, it is either the circuit breaker on the genset or in your distribution panel that needs to be reset. Good Luck, this should Fixya!

Posted on Mar 02, 2009

erickg
  • 116 Answers

SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

SOURCE: Have an Onan RV generator. WHat kind of oil do I

Standard 30W motor oil.

Posted on Apr 30, 2009

mamicheddy
  • 79 Answers

SOURCE: Only runs if I hold the start switch

The problem is that you are not creating voltage. Remove front cover. Place a volt meter on the breaker. Start genset and you will see no voltage present. The problem could be with the brushes, rings, rotor, stator, voltage regulator, or control board.

Posted on May 09, 2009

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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.

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Onan 5500 marque gold turns over but, won't start. fault code is 32 but, batteries ok, air cleaner ok, fuel pumping, oil changed, won't start


Code 32 is a low cranking speed sense. You didn't mention a Spec # which would help. You say batteries are ok, but the generator is not getting enough cranking amps or voltage to maintain the control properly. Check, battery voltage, wiring, any in line isolation solenoids, check generator solenoid, also make sure there is no mechanical binding on the generator, a good way to do that is remove the spark plugs DISCONNECT THE BATTERY to prevent starting, underneath where the air intake is under the alternator is a plastic plug, remove that and you can put a socket I believe 3/4" up onto the alternator shaft and rotate the engine, if it tuns freely there is no binding, if you feel it is hard to move, check the drive train, belts, pulleys underneath (A lot of work, best to take to a dealer if it is mechanically bound)

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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.
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Check the spark plug and the ignition coil for good sparking.

Get the spark plug out, or with another spark plug connected to high voltage cable, outside the motor, the outer part of the plug connected to motor ground and see if spark is present at cranking.

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If it walks like a duck and quaxks like a duck?

If it grinds like a starter ?

Your alternator would hsve to be in absolutely unaerviceable condition to match a noise a starter makes.

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1 Answer

Onan microlite 4000 generator no output


Hi, The 4000 rv unit unit is equipped with full diagnostics, and is indicated by the status light blinking. The blinking sequence, blinks a code as to the fault. If your unit runs and the status light is on without blinking, it is either the circuit breaker on the genset or in your distribution panel that needs to be reset. Good Luck, this should Fixya!

Mar 02, 2009 | Watts Onan Portable Generator - 4000 ,...

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