Originally Posted by ceejay
I'm getting ready to use my camper for the first time in June so I started testing everything and when I push and hold the reset button on the furnace and hold it for 30 seconds to a minute after lighting the pilot the pilot does not want to stay on.
Could anyone tell me what might be wrong and how to fix it?
Sounds like you need a new thermocouple. Not expensive, and not hard to replace if you have some mechanical aptitude. I just recently replaced the one in my home furnace. New thermocouple was $8.79 and took about 15 minutes to replace. It will probably take somewhat longer than that in an RV because of the way the furnaces are built and the sometimes difficult access, but they use the same parts. Thermocouples are available in different lengths and available at any RV parts store. They're also a common part at home improvement and hardware stores, and probably cheaper, but they might not have the shorter lengths used in RV furnaces.
It's also possible that you have a flame problem and it is not heating the thermocouple adequately, or something has moved and the end of the thermocouple is not in the flame. I have experienced both of those problems over the years with RV water heaters and furnaces.
If all of what I'm saying sounds like a foreign language to you, it's probably time to take it to an RV repair shop.