The MC 36165MC is a replacement air flow sail switch designed for select Atwood HydroFlame AFM/AFL and Dometic furnace models. This critical safety component detects air flow and verifies that the blower motor is functioning properly before allowing the furnace to ignite and begin heating.
Key Features:
- OEM quality replacement for Atwood/Dometic RV furnaces
- Safety device that prevents ignition without proper air flow
- Features flat blade paddle design
- Includes mounting bracket upgrade kit
- Direct replacement for part numbers 31094, 33063, and 33082
How It Works:
The sail switch acts as an air proving device that monitors blower motor operation. When proper air flow is detected, the paddle depresses and completes the electrical circuit, allowing the furnace ignition sequence to proceed. This ensures adequate air and gas mixture for safe, efficient combustion.
Troubleshooting:
Test the switch using a multimeter set to continuity mode. With the paddle depressed, the switch should show continuity. When air is blown across the paddle, the switch should open and break continuity. Common failure modes include bent paddles, loose wire connections, or obstructions between the paddle and switch contact.
Compatibility:
Compatible with Atwood furnace models including AFMD25111, AFMD25121, AFMD25131, AFMD30111, AFMD30121, AFMD30131, AFMD35111, AFMD35121, AFMD35131, AFLA35211, AFLA40211, AFLD35111, AFLD40111, and similar AFL/AFM series models. Also fits compatible Dometic DFMD series furnaces. Compare with your existing switch to verify proper blade style before ordering.
