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Possible meeces chewed through a wire or two. If as you say no fire when you put starting fluid in it, possible electric snafu. Possible air in the Nat Gas line into the regulator. My$.02 Paul B
We have a propane 17kw Generac.About the only problem we have experienced that sounds similar to yours was one that may not affect natural-gas models ... tho "gas is gas." Sort of. I'll see if I can find the pix to make this less babblespeak, but mud daubers -- https://hgic.clemson.edu/factsheet/mud-daubers/ -- had blocked a valve where the gas line connects to the generator. Could not see this without getting on ground and loooking up.Good luck on finding the cause. Generators are great peace of mind, albeit an expensive way to repicate the grid. Bill
Possible fuel solenoid stuck shut or the wiring for same not allowing voltage thru. Fuses in control panel good? Another $.02 Paul B
I would also think you should hear or feel the solenoid operate when you power up. May need a trusty assistant for that. Paul B
Sounds like a plan. When did the genset run last? Paul B
It would have thrown a caution light or red light if it had detected any problems during the weekly run. GliderJohn
I did a quick search for "generac 15kw lpg won't start" and got a bunch of hits on older units. They might be your exact model, but the theory should be the same.
I had some electricians dissing Generac's control board and wiring about 12 years ago so if you can get a wiring diagram with expected voltages at what time and state, that would be a place to start, but the Solenoid is the first place. And your battery voltage may be a little low to operate it if the voltage sags when you try to start it. Solenoids and thermocouples always gave me issues on my instant on hot water heaters so it sounds like supply line issues. Good luck and let us know what you find out.
sprayed an engine starter in both chambers and all I got was a back fire.
Hmmmm. I've never seen an engine with good ignition that wouldn't run when you did that, but you say you have good spark.. how about compression? Timing? Just throwing out ideas..
Do you have a link to a manual by any chance, particularly one with a schematic diagram?Failing that a Model No and year of manufacture.
When was the last time it ran? Does it automatically cycle every week on a test cycle? We have a 22 kw Generac I put in after Hurricane Harvey in 2017...great peace of mind, and we've used it quite a bit. Nice to be the only house with lights while it's total blackness all around.You could call the tech from your local Generac service center, wouldn't cost much to have them come out and service it, check for faults if you come up empty after trying everything.