We have a mountain retreat where we leave our rig from about the end of May until early October. We took our new Wind River 240 RKSW up there on Thursday before Memorial Day just before 3-4 days of intermittent thundershowers, hail, and even light snow. This was taken right after we unhooked:
We talked about how much more comfortable we were in those few days in our WR than we ever were in our Jayco Eagle. Happiness ensued.
The next weekend, it was warmer and so we didn't turn on the furnace until the first morning to take the chill off. When my DW turned it on, there was an awful screeching sound and so she immediately turned it off again.
We decided to have some coffee while we pondered what to do. As we were sitting outside the RV, my DW saw a small wren take a stick into the furnace intake tube to make her nest. I immediately got out the duct tape after she left the "nest."
Eventually we removed the panel and fished out as many sticks as we could. We held our breath and turned on the furnace. It seemed to work well without the noise, but I suspect there may still be sticks down in the air housing. The big issue is that not long after that, we noticed another wren trying to take another stick into the intake tube. The manufacturer's installation booklet mentions never to cover the intake or exhaust tubes, so I'm wondering how to resolve this. As of now we are back to duct tape, no heat, and lots of heavy blankets.