SOURCE: I have an Onan 2500 LP generator. What is the red knob for?
That knob should be to bring pressure up and down with 0 being off or the lowest range of the regulator. This regulator is adjustable for different applications apparently.
SOURCE: onan microlight 2500 lp stop working
This type of generator has an oil-level sensor to prevent operation when it is too low. They burn oil pretty quickly, and 138 hours may have put you below the minimum. Check to see that the oil is filled to the right mark on the dipstick, and be sure it is on level ground when you do this.
SOURCE: Onan 4 ky generator quits when a/c is turned on?
To pick up a AC unit, especially during high compressor head pressure starting, the 4KW is the bare minimum required depending on the AC btu. If the engine cannot deliver full HP due to engine, or performance issues, it will do as you describe. How many hours on the 4KW? Is it tuned up? Have it load bank tested by a dealer to isolate AC issue from generator.
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