MC 31094MC RV Furnace Air Flow Sail Switch for Atwood Dometic

The MC 31094MC is a replacement air flow sail switch designed for select Atwood and Dometic RV furnaces. This critical safety component ensures proper operation of your RV furnace's blower motor by detecting air flow and verifying the blower motor is functioning correctly before allowing the furnace to ignite and begin heating.

Key Features:

• Rated for 125/250VAC operation
• Detects air flow to prevent unsafe furnace operation
• Features a paddle-style design that provides continuity when depressed
• Direct replacement for OEM part number 31094
• Made in USA with high-quality materials

Compatibility:

• Atwood Hydroflame AFMD Series (AFMD25, AFMD30, AFMD35) and Dometic DFMD Series furnaces with serial numbers before 72489156
• Atwood AFLD Series and Dometic DFLD (DC powered) Series furnaces with serial numbers before 72991127
• Atwood AFLA Series and Dometic DFLA (AC powered) Series furnaces with serial numbers before 81689155

Installation Notes: When replacing a sail switch, it must be replaced with the exact same size to ensure proper fit and function. Common issues include bent paddles, loose wire connections, or obstructions between the paddle and switch contact. The switch should show continuity when the paddle is depressed and break continuity when air flows through it.

Troubleshooting: Test the sail switch by setting a multimeter to the continuity setting and attaching one lead to each terminal. With the switch closed, the multimeter should indicate continuity. Blow air into the sail switch and watch the multimeter - the switch should open and break continuity. If the switch fails to open, it is likely faulty and needs replacement.