you can wire it to open or close on temperature rise

The Fenwal 05-127694-448 Cable Assembly is a high-performance 48-inch low voltage wiring harness engineered for stable signal transmission in HVAC ignition control systems

The International Environmental 70665406 Relay is an OEM replacement part engineered for high-reliability switching in fan coil units and industrial HVACR systems

How do I fix a relay that isn't sensing the blower motor

Raypak 014307F Temp Controller 30067439-890 you can wire it toThe Raypak 014307F Temp Controller is an essential OEM replacement part designed for precision temperature regulation in Raypak atmospheric heaters and select pool heater models. This auto reset temperature controller serves as a critical safety and operational component, ensuring the unit maintains set point temperatures without manual intervention after a temporary thermal cutoff. Engineered for high duty cycles, the 014307F limit switch features