York S1-025-35397-000 Limit Control this switch is "normally closed"

this switch is "normally closed" and should show near-zero resistance

Reduced Downtime: Simplifies troubleshooting and restores operation quickly after safety protocols are triggered

How do I verify the temperature rating

Common Questions How many spacers are needed for a complete valve service

Tasked with ensuring airtight integrity

York S1-025-35397-000 Limit Control this switch is "normally closed"The York S1 025 35397 000 is an essential manual reset limit control engineered for precision thermal monitoring within high efficiency furnace heat exchangers and air handling units. As a genuine OEM York replacement part, this HVAC safety switch is calibrated to provide high limit protection by breaking the electrical circuit to the gas valve or ignition control if internal temperatures exceed factory safety thresholds. Unlike automatic switches,