The MC 31093MC is a replacement sail switch designed for select Atwood AFS and AFM Series furnaces. This sail switch functions as an air proving device and critical safety component that prevents ignition until it detects 75% of the motor's RPM, ensuring the combustion wheel rotates fast enough to create a proper air and gas mixture for smooth ignition.
Key Features:
- Electrical Rating: 0.1A 125/250VAC
- Aftermarket replacement by MC Enterprise for OEM part 31093
- When the paddle is depressed, continuity is maintained through the switch
- Must be replaced with exact same size for proper operation
Compatibility:
Compatible with Dometic Atwood furnaces with serial numbers BEFORE 72498929, including models: AFSAD12111, AFSAD12121, AFSAD12131, AFSAD12141, AFSD12111, AFSD12121, AFSD12131, AFSD12141, AFSD16111, AFSD16121, AFSD16131, AFSD16141, AFSD20111, AFSD20121, AFSD20131, AFSD20141, AFMD16111, AFMD16121, AFMD16131, AFMD16141, AFMD16151, AFMD20111, AFMD20121, AFMD20131, AFMD20141, AFMD20151.
Troubleshooting:
The most common problems with sail switches include bent paddles, loose wire connections, or obstructions between the paddle and switch contact. Test for proper operation by checking for continuity when the paddle is depressed.
