York S1-7975-3771 Relay Verify 120V across the terminals

Verify 120V across the terminals using a multimeter

and 45-second furnace ignition systems

As a L225-F manual reset switch

Using a switch with a different thermal cutout rating can lead to equipment damage or safety hazards

York S1-7975-3771 Relay Verify 120V across the terminalsThe York S1 7975 3771 is a professional grade 24V SPDT Fan Relay designed for high cycle reliability in residential and light commercial air handlers. For technicians troubleshooting blower motor sequencing or intermittent fan failures, this component provides the specific low voltage logic required to switch high amperage loads. This Single Pole Double Throw relay is the direct OEM replacement for legacy part numbers S1 6313 2271 and 134 20103 301D,