I have had intermittent ignition problems with my Atwood water heater ever since I purchased my new motorhome in 2006. I followed all trouble shooting instructions to the letter. I finally think I found the root cause. There is a flame divertor at for the main burner. In the troubleshooting guide, it says it is a "dime-shaped" divertor. I assume that the guide should have read a "dime-sized" divertor. Well on my electronic ignition water heater the divertor was about the diameter of a pencil eraser, but I never gave it a second thought -- until I had a used burner in my hands. The divertor was the size of a dime. I switched out the divertors and it sure seems like the ignition is much better. I can only assume that Atwood had someone grabbed a pilot ignition burner and put it in an electronic ignition water heater. Or perhaps someone at the dealer was troubleshooting a pilot ignition water heater and swapped it out. Perhaps this will help someone else.