Resideo Q309A1970 Thermocouple

The Resideo Q309A1970 Thermocouple is a high-performance pilot flame detector designed for standing pilot systems in residential and commercial gas-fired equipment. This 30-millivolt heavy-duty thermocouple features a 24-inch lead and a standardized split nut connection for a secure fit to the gas control valve. It is engineered to provide precise millivolt output, typically between 26mV and 32mV open circuit, ensuring the safety string remains closed while the pilot is active and providing a rapid millivolt shut-off if the flame is extinguished. The copper construction and sensitive tip design allow for optimized heat transfer and consistent voltage generation under high-ambient conditions. As a direct replacement for many Honeywell and Resideo thermocouple models, this component is essential for maintaining the integrity of the pilot burner assembly and preventing unburned gas accumulation. Its universal compatibility makes it a staple for contractors stocking furnace replacement parts.

Key Benefits:

• Reliable Flame Sensing: Delivers a consistent 30 millivolt thermocouple signal to the gas valve to ensure uninterrupted heating cycles.
• Universal Fit: Includes a split nut connection and is compatible with a wide range of standing pilot gas valves.
• Durable Construction: High-grade copper lead resists oxidation and maintains electrical conductivity over extended service life.
• Safety Assurance: Provides a critical failsafe by cutting off gas flow within seconds of pilot flame failure.

Common Questions:

• What is the exact lead length for this model? The Q309A1970 features a 24-inch copper lead, suitable for most standard residential furnaces and boilers.
• Will this work with a thermopile system? No, this is a 30mV thermocouple. Thermopile systems typically require 750mV power generators to operate the gas valve without an external power source.
• How do I test if this part is failing? Use a multimeter set to millivolts; a healthy pilot flame detector should produce at least 20-30mV while under the heat of the pilot flame.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.