Yellow is likely a battery issue. Low battery voltage or not charging, failed battery, etc.
These units require schedule maintence. Go to
https://www.generac.com/service-support/product-support-lookup
Find model installation operation manual and familiarize yourself with the system or pay the service tech.
SOURCE: 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.
Carl
SOURCE: Generac Guardian 15 kw overspeed fault
Did you remember to set the overspeed shutdown threshold on the control board?
SOURCE: installed a generac 20kw about a year ago, ran
With the engine off, check the exciter brushes and slip rings which supply magnetic power for the alternator winding in the stator. Also, check the motor-to-alternator mechanical coupling. Check the breakers for tripping. To service beyond this point requires a schematic of the alternator, a voltmeter, plus knowledge of what the schematic is telling you. Good luck!
SOURCE: generac 20,000kW Standby generator doesn't start shows message STOP ALARM OVERCRANKED
20,000KW is a big power standby generator. For generator that won'r start, the reasons may be various.
1. Air in the fuel system
2. Fuel Line Obstruction
3. Fuel Filter Clogging
4. The Handle Position of Fuel Injection Pump Is Not Correct
5. Fuel Injector Problem - Little fuel injection or fuel injection is not atomized
6. Oil Supply Problem - Oil transfer pump doesn't supply oil or the oil supply is brokenly.
1. Battery Power Shortage
2. Circuit Wiring Error or Poor Contact
More information at this Why Diesel Generator Fail to Start
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