Well i decided to do my over due nozzle change. Installed and no fire. Trouble shot per TS guide and verified per
1. Turn the Control Switch OFF.
2. Check "Ignition Coil" for proper operation by: Removing C-plug from "Control Unit". Apply DC power (+) to C-8 plug (yellow wire) and ground (-) to C-5 plug (brown wire). A spark should now appear across the "Ignition Electrodes no ignition. Verified photo cell operation with Fluke meter as being within range.
Ignition coil fails to operate. Will reach out to Mr Rudy for a new coil in am
Scott
http://www.aquahot.com/files/service_manual/AHE-100-02S%20Service%20Manual%20Rev.%20B%209-27-2011.pdf
Page 47 in TS tree
I had to put a new one in mine since we returned home. I had a new spare. I am no longer carrying a spare as I have a complete burner except for controller. Will change it out if anything fails and will repair it when I return home
When I bought my coach I had to change the ignition coil as it was flakey.