or the gas valve failing to pull in even when the board sends a signal

Durable Construction: Built with high-grade materials to withstand the thermal cycling typical of modern HVAC combustion sequences

The Reznor 136736 is a critical safety component engineered for precise temperature monitoring in commercial and industrial HVAC systems

Designed as the primary direct replacement for S1-8865-3611

Simplified Troubleshooting: Acting as a clear indicator of airflow or combustion issues

White-Rodgers 1E78-151 Thermostat or the gas valve failingThe White Rodgers 1E78 151 is a job site staple for contractors looking for a reliable, vertical profile 5 2 day programmable thermostat. This 70 Series economy model is engineered for single stage 1H 1C HVAC systems, providing a seamless digital upgrade for older mechanical units without requiring a common wire (C wire). It operates on 24V AC low voltage systems and is fully compatible with millivolt heating applications, making it a versatile choice