If your RV Furnace is blowing cold air and does not light or ignite, you may have an issue with your furnace Sail Switch. If you have a pet, it may be the fur that gets caught up on the switch and it could be as simple as cleaning the fur off the switch to get your furnace back up and running. Sometimes, these Sail Switches just go bad for no apparent reason and need to be replaced. Depending on the access to your RV's furnace, the repair may be quick and easy or... you may need to remove the entire furnace to get to the switch to clean and/or replace it (like we did). Our video will show you step by step how we diagnosed, removed and repaired the issue with our Keystone Cougar 25RES Atwood furnace as well as how we prevented the problem from returning.