I have a brand new Honda EU6500 flashing starts but then quits and gives error code E-21. Turns out the rubber batter hold down was undone and blocks air intake so engine quits. Put strap back in place and now runs fine.
Battery strap, if left behind the battery, covers the air-intake of engine that is just behind the battery, resultantly the engine runs on highly rich mixture which shuts down engine after a while. Once the battery strap is properly harnessing the battery the intake is fully opened and appropriate mixture is fed to engine.
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SOURCE: Kipor 6700TA displaying charge fault (P5)
Check for loose or rusty battery cables. Unscrew the rear cover and locate the red battery wire. Disconnect it and, using a multi meter, check its resistance: it should have a very low value. Do the same with the other wire.
Start the generator and remove battery wires. If the voltage between them is zero then a fuse is blown.
Next open the front panel (where the display is), there you will find two blue wires with covered fuses, check and replace those fuses if found faulty.
If the problem is still there then it could be the charge regulator. Open the back cover by removing the six nuts. Near the edge you will find a component with silver cover resembling plates. There are three wires leading from it. Check resistance between these wires (one by one) and its body: it should be infinite, if not then replace it. remove the charge regulator and take it to a generator spare shop. The person there will further inspect it and will tell you if you need to replace it or repair it.
Hope this solves your problem.
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