York S1-2790-3171 Fan Switch 321894-706 contractor-grade installations during service calls

contractor-grade installations during service calls

By preventing condensate backup

preventing common combustion issues such as delayed ignition or soot buildup

000 hours under standard conditions

Designed with 70% fewer moving parts than reciprocating models

York S1-2790-3171 Fan Switch 321894-706 contractor-grade installations during service callsThe York S1 2790 3171 Fan Switch is an essential OEM component designed for precise fan and limit control in residential heating systems. As an industrial grade furnace fan limit switch replacement, this part ensures optimal airflow by managing the blower activation cycle and providing critical high limit safety protection. This switch is the direct manufacturer specified equivalent for the F120 35F fan switch, engineered to maintain system integrity