onan shutdown from temp???
Yes it can.. mine did a few months ago.. 7.5k Onan in 2006 Newmar DSDP. It was the temp sensor which is screwed into the thermostat housing. It's a DIY if you feel comfortable in tight spaces and have the correct tools. The port where the sensor screws into gets corroded, so use heat to help in removal and don't be surprised if the brass end piece brakes off. If that happens, remove thermostat housing and thermostat, shove a shop rag deep into housing. Use punch to punch stuck brass nipple into housing and then pull shop rag out with brass piece in it. Clean out port with wire brush and install new temp sensor and replace thermostat and housing.
Hope this helps.