Technicians typically check for a "Limit Switch Open" fault code

the 8406-037BX is technically identical to the 8406-037 in form

it can be used in any system requiring a 24V coil relay with a 14A/120V or 240V contact rating

and 210G series gas regulators

you can always go up in voltage rating (e

York S1-025-38585-000 Limit Switch Technicians typically check for aThe York S1 025 38585 000 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems. This automatic reset limit switch features a single pole single throw (SPST) configuration, engineered to open the electrical circuit at 55F and close at 45F. For veteran techs troubleshooting York, Coleman, or Luxaire units, this part acts as the primary defense against heat exchanger failure by monitoring temperatures