The York A1905 Limit Switch/Thermostat Disc (36T01B3) is an automatic reset temperature control switch used in York furnaces and HVAC units. It safeguards the system by monitoring the heat exchanger temperature ? opening at 165F to stop overheating and closing at 135F to resume normal operation. This precise control maintains safe system temperatures and protects critical components. Key Features: OEM York replacement part ensures accurate fit and dependable function. Automatic reset design for reliable cycling between heating and cooldown. Temperature range: Opens at 165F, closes at 135F. Durable metal housing for long-lasting performance under heat stress. Pre-calibrated and tested for consistent thermal response. Specifications: Part Numbers: A1905, 44898, 36T01B3 Type: Limit Switch / Thermostat Disc Operation: Auto Reset Open Temperature: 165F Close Temperature: 135F Application: Furnace / HVAC System Compatible Models: D6NZ060N06546NX D6NQ060N09006NX D2NX036D09046 DAYQF042N080X D7CG048N09958EC D2NX036D09025NX D6NX036D09006NX D6NZ048N09025NX JV40N1CGAE1CMT32A2 T07ZHN10N2AAA7 and more. Why Choose This Item: The York A1905 (36T01B3) Limit Switch provides essential thermal protection for your furnace, preventing overheating while maintaining system efficiency. As a genuine OEM component, it ensures safe, reliable operation and helps extend the lifespan of your heating system.