Atwood Furnace Switch

[UsualSuspect]

This past weekend I went out to check the coach since we had our first rain, and to see if I had any leaks, which I didn't. I decided to turn on some heat, and found the rear heater was not working. I pulled the exterior cover off, and there was no indicator light on the board, but there was a black switch that has "Reset" on it. I pushed it to the reset position, then back to the on position, and the heater motor started, then I heard it ignite, then warm air in the rear of the coach . What does that switch reset?
I know the heater worked 2 years ago when I bought it, but I don't think we have used it since then. I am thinking if I had to reset the heater something may not be working right , or I should at least look into it a bit further and see what I should be checking.

[RV Wizard]

The switch has a built in circuit breaker but will also disconnect power from the control board the same way turning the furnace off at the T'stat and back on to get the unit to go through the ignition sequence. Low voltage and/or high amperage can trip the circuit breaker. Having the gas off or an air pocket along with an actual ignition fault can cause the board to go into "lock out".