Atwood hot water heater

I took it apart and cleaned it. Working good. Thanks for the feedback. Big help

Just a guess - but if your rig is older then maybe the interior of the water heater has accumulated calcium/crud which might interfere with it's heating ability. You can clean this crud out by emptying the water heater and filling with vinegar solution and allowing it to soak for a day or so. Just a thought.

Remove burner tube...clean with small bottle brush
Unscrew orifice from gas valve....soak in alcohol then blow dry (low air pressure and no poking anything thru hole
Remove spark electrode and clean soot/carbon from it using emery cloth
push a wire thru combustion chamber out exhaust...tie rag to wire then pull back thru doing a 'chimney sweep' of the 'U' tube

Reassemble and fire it up.
Adjust air shutter (slotted sleeve) open/close to achieve a strong blue flame with 'slight' roar (too loud...to much air/orange-sooty flame---not enough air)

Agreed, probably a spiderweb messing with the flame. Remember never poke into the tiny gas orifice with a pin or other sharp object or you could ruin it.

Needs cleaning. Remove the outside cover and clean inside the burner tube. Spiders love the smell of propane. You should not be seeing soot.