Bypassing a safety limit is never recommended

a full replacement is required to maintain a consistent flame signal

zone valves

This furnace collector box seal is manufactured from high-grade elastomers designed to withstand the acidic condensate and thermal cycling typical of high-efficiency 90+ AFUE systems

OEM Compatibility: Specific physical and electrical properties ensure direct replacement for legacy Protech and Rheem model numbers

Johnson Controls T-4000-2146 Plastic Cover Bypassing a safety limit isThe Johnson Controls T 4000 2146 is a professional grade vertical pneumatic thermostat cover designed for heavy duty commercial and industrial HVACR environments. This beige plastic enclosure is specifically engineered for the Johnson Controls T 4000 series, providing a precise fit for vertical mounting configurations. It features a built in ? F ? C thermometer and a setpoint window, allowing for immediate visual verification of ambient temperature