Is the rv plugged into power?
Any poop smell to it?
Is your battery being charged while the smell is present?
Have you popped the tops of the batteries and checked the water level?
Can you pinpoint the smell stronger in any area? Higher or lower?
Have you opened all of the windows and turned on the fans for a few hours?
How many times have you used the unit compared to how fast the smell came on? Is this new, or did you just get the unit and this smell has been present?
I'd really like you to check your batteries. If they have been charging and any water has evaporated, they start to smell as the lead plates are exposed to air. The process excelarates quickly and the smell turns stronger and takes on more poop/propaneish smell.
RVM#78 - -USAF- F-15 Eagle Radar Vet
2005 Fleetwood Revolution
'12 Chevy 2500HD
'15 Airstream International Signature 27FB