Did I catch my rig about to burn ?

That is normal for a water heater that isn't adjusted properly, it should sound like a jet engine when it is running, if it is quiet it isn't working properly.

Well I am familiar with the sound and have heard it throughout my recent 2 week adventure, I hear it at night mostly when it is quiet. How did it come out

of adjustment and what needs to be adjusted. It's been fine for the last 2 years and my previous rig was 6 years old and I didn't need to do anything to that one.

The plastic/burnt wiring smell is what troubled me.

On the tube that is at the front, just about dead center near the bottom with the 1/4" screw in it, loosen the screw - 1/4" nut driver works best, then move the tube to the left to open up the vent holes until it sounds like a loud jet engine.

I had a similar thing happen to my water heater. Turned out there was a mud dauber nest in tube that mixes LP and air. Cleaned it out and cleaned up soot from side of MH and water heater cover. I now have a SS screen cover over the vent. Spiders can also create the problem.

Usually when that happens there's a spider web in burner (mixer) tube. Happened to me before.

First thing is be sure it's clean. Compressed air. I blow out the furnace and frig too a couple times a year.

Funny but the heater has been on for the past two weeks constantly, I wonder if a spider decided last night to get in there, we do have quite a few here. I use compressed air to clean my rig before and after trips especially the fridge vent. Im inside it right now going nose to tail. Come to think of it I turned the heater off yesterday when I arrived home.

Funny story, been hearing a knock inside, sounded like a tapping on the window, re arranged the cabinets ,etc during my travels, even narrowed it down by rocking the rig while parked . Planned on having the DW ride with me to narrow it down( she doesn't like drag racing as much as I do so I hit the road for 2 weeks by myself, Sonoma/Seattle events) anyway I get home and look up and I believe the pull strap from the awning is the culprit, it's sticking out more than normal, well being solo I could enjoy my classic rock a little louder....to drown out the tapping you see....

tpi wrote:
Usually when that happens there's a spider web in burner (mixer) tube. Happened to me before.

Same here, and it takes VERY LITTLE in that tube to mess up the mixture because the gas pressure is so low into the burner tube. In my case, when I removed the burner tube I looked inside, saw nothing, blew in it and reinstalled. Same issue. After no luck solving the problem I removed the burner tube a looked with a flash light and could just barely make out so wisps of cobwebs. I blew in it but they stayed. I used a stick to clean them out, reinstalled and problem solved. So cobwebs that were barely visible that did not seem to impede gas flow at all were enough to mess up the mixture and make the burner run improperly.

tpi wrote:
Usually when that happens there's a spider web in burner (mixer) tube. Happened to me before.

Me too.

PUCampin wrote:

tpi wrote:
Usually when that happens there's a spider web in burner (mixer) tube. Happened to me before.

Same here, and it takes VERY LITTLE in that tube to mess up the mixture because the gas pressure is so low into the burner tube. In my case, when I removed the burner tube I looked inside, saw nothing, blew in it and reinstalled. Same issue. After no luck solving the problem I removed the burner tube a looked with a flash light and could just barely make out so wisps of cobwebs. I blew in it but they stayed. I used a stick to clean them out, reinstalled and problem solved. So cobwebs that were barely visible that did not seem to impede gas flow at all were enough to mess up the mixture and make the burner run improperly.

Exactly what happened with mine. Easy fix but deadly if you don't.