Description
1.[How to know you need to replace]---When your would run normally, if you hear the igniter begin to fire, then the furnace would light, then immediately go out.Maybe you can consider the problem of the sail switch.
2.[How does it work]---The sail switch is an air proving device. It is a safety component that will not let ignition occur until it sees 75% of the motor’s rpm’s. It ensures that the combustion wheel is rotating fast enough so that there is a proper air and gas mixture for smooth ignition.
3.[Compatible models]---Furnace AFM Series with Serial Numbers BEFORE 72489156: AFMD25111, AFMD25121, AFMD25131, AFMD25141, AFMD25151, AFMD30111, AFMD30121, AFMD30131, AFMD30141, AFMD30151, AFMD35111, AFMD35121, AFMD35131, AFMD35141, AFMD35151.
4.[Compatible models]--- Furnace AFLD Series with Serial Numbers BEFORE 72991127: AFLD35111, AFLD35121, AFLD35131, AFLD40111, AFLD40121, AFLD40131.
5.[Compatible models]---Furnace DFMD Series with Serial Number BEFORE 72489156: DFMD25111, DFMD25121, DFMD25131, DFMD25141 and DFMD25151.
