Have RV Questions? Ask an RV Mechanic Online.
Hi my name is Robert....
You say that after the blower comes on the gas valve clicks, at the same time the electrode should spark, is the electrode sparking at all?
Please keep in mind this might take some going back and forth, follow ups are included and so far I need more information to go on....
The key is the no spark, the same time the gas valve opens it should spark, if it is not sparking there is an issue with the electrode or circuit board.
So I would have the board tested to start. Most RV shops have a special board tester and can tell if the board is bad. IF the board is good and it is not sparking I would replace the electrode. I would also try and have the LP pressure checked at the back of the furnace, a manometer is needed for that. IF it was sparking and lighting off then it could be a LP pressure issue, it is going to be a process of elimination, click HERE for a service manual, it will show you how to test everything.
Also the mud dauber issue is a concern, sometimes it is very difficult to get all that out without flushing with water. That would require the furnace to be removed. I have seen some real bad ones where air alone did not help....
IF you need more help please let me know.... Robert
Hi.... Was just checking in to see if my answer helped, if you have more questions or concerns please feel free to contact me... Robert