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Old 02-24-2019, 02:48 AM   #6
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Brand: Thor Motor Coach
Model: Serrano
State: Florida
Posts: 137
THOR #8144
If you can get it open then the real problem will need to be addressed. There are a number of things that could cause the gen to shut down. The first is mentioned in the manuals, the oil level being too low. (Probably unlikely.) A breakdown of the spark plug (4kw normally has only one cylinder) after it gets hot has been a cause of the same issue. More unlikely on a newer genset would be a fuel pump that breaks down after it reaches normal operating temperature. Likewise, an ignition module intermittent failure. Unless you are a pretty good mechanic (knowledgeable and NIMBLE) you might want to consider a Cummings/Onan service center, rather than an RV repair shop. If it is still in warranty, look for an Authorized Cummings service center. My guess is that they would get you serviced within a couple of days. (I used to work for one about 30 years ago)
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