Welcome to the Newmar forum.
Help in getting around irv2.
The igniter may need some cleaning with a soft cloth or if rust cleaning of igniter for clean ground connections. The tube may have a spider web in it that needs to be cleaned out or mud dabbers.
This link has WH & FURNACE INFO. More info in
this link for other appliances.
All the links below un my signature have answers for your Newmar.
Enjoy the forum safe travels.