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Hi my name is Robert.....
This could be a few things. Could be an issue with the LP, circuit board or electrode. I would access the back of the furnace and check the connector on the board, make sure it is clean and tight. I would next remove the board and have a RV shop test the board out, most RV shops have a special tester and can see if the board is at fault. IF the board is good then the next step would be to have the LP pressure checked, this would be hard for you to do without a manometer. Go to the main tank, shut the valve and slowly open it back up, if the valve is opened to fast sometimes the regulator can lock up and you might not get the proper pressure. IF the board and LP pressure is good, then it could be an issue with the electrode and may need to be adjusted. To help you out click HERE for a service manual it should help some........ Hope this helps... Robert
The actual electrode senses the flame and will send a signal to the board click HERE and see page 5. If you scroll down you will also see the electrode on the diagram, should be able to access the back of the furnace and remove a plate to get at it. IF you have no access panel outside then the furnace will have to be removed, not all RV'S have the inspection cover on the outside.
I am sure if it has been to the shop they have verified the LP pressure, that should always be checked first to make sure it is not the issue, the electrode should be inspected as well. With it being intermittent it is difficult to know which component is causing the issue and this is going to be a process of elimination. Click HERE for an actual service manual, your model is covered..... Robert