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There is an excellent video on the Escape website showing how to remove and replace the sail switch, which can either accumulate lint/debris and need cleaning or can sometimes fail and need replacing. The photo below shows the location of the sail switch on furnaces with the external access door. It is mounted on a plastic block - the screwdriver is pointing at it in the photo. You remove the two wires, then the single mounting screw on the plastic block and it can be wiggled out of the furnace. If you need to replace the switch, there are two screws fastening it to the plastic block. This is an easy repair that most people can do themselves - it's good to know where the sail switch is and perhaps carry a spare so that if you have problems while camping you can fix it rather than being without a furnace for the rest of your trip.
Nice to see you here David. Thanks for the info and pictures.
What is the sail switch model number?
Dometic 33081 – Click here to find an Authorized Dometic Service center for purchasing.
To look up your Dometic DFSAD12 model number Click here
For anyone inclined to diagnose and work on their furnace themselves this Atwood furnace tech training manual is an excellent resource. It has thorough explanations of how the furnace functions and how to troubleshoot various problems. Several years ago Atwood was purchased by Dometic, the furnaces are essentially the same but the model numbers now start with a "D", previously the first letter was "A" for Atwood. The furnace with the external access door used for the past several years is DFADF12131.
For warranty-related issues on Dometic Click here