Genset Surging Code 14
Seneca has a Quiet Diesel QD5500 on board. Took a day trip yesterday to the lake, and the generator started fine, but after 5-10 minutes it started surging, then 5 minutes later it just shut down. My message panel isn't displaying messages now, so I had to rely on the Onan codes to figure out why it was shutting down. It was Code 14, which is over-frequency. This indicates it's running fast, but it was actually momentarily sputtering, then speeding back up, and I think maybe even over-speeding a bit when it would catch back up. Looks like the over-speed sensor was the first to trigger the shutdown.
I read up on it, but most of what I was finding had to do with gas generators, and most of the problems seemed to be with the carburetor varnishing up. Since the diesel doesn't have a carb, I pretty much knew that wasn't it. Besides it sounded a bit like it was starving for fuel, then catching back up when enough fuel would trickle through to let it run properly for a few seconds, before stumbling again. I suspected a fuel filter clog.
So, I took a chance and picked up a new fuel filter, and changed it out. Sputtered for about 15 or 20 seconds, then smoothed right out and purred like a kitten. Ran it for an hour or two with the AC running to provide a load, and it ran perfectly. It's got maybe 150 hours since the last fuel filter change. It's a short shift for what was a new filter 150 hours ago, but I'd much rather this than dirty fuel clogging fuel injectors and wearing out the pump.
Just wanted to post this for anyone running into this problem and wondering where to start to troubleshoot the thing. I'm about due for an oil change also, and I'll get that done in the next week or so as well, once I can find an Onan oil filter and a new air filter as well. Hope this helps someone down the road who may need it.
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