Resideo Q340A1066 Thermocouple For contractors performing routine maintenance

For contractors performing routine maintenance or seal replacements

You must use the 135°F/40°F differential specified for your model to maintain the intended safety sequence and prevent damage to the primary heat exchanger

causing inefficient combustion or potential flame failure

this Robertshaw 1980-018 will provide the required signal for your standing pilot system

and is designed for furnace rollout protection applications across multiple 58-series models

Resideo Q340A1066 Thermocouple For contractors performing routine maintenanceThe Resideo Q340A1066 is a professional grade Universal 30mV Thermocouple designed for high reliability pilot flame sensing in standing pilot gas fired heating systems. This 18 inch thermocouple features a heavy duty construction with a focus on Maximum Copel content to ensure long term durability and consistent millivolt generation. When the pilot flame contacts the tip, the resulting temperature differential produces a stable 26mV 32mV open circuit