If the plunger is stuck in the "open" position or the internal contacts have carbon buildup

Broad Compatibility: Fits Bunn commercial brewers like the T3

"leaking" oil

which are critical for preventing heat exchanger fatigue and ensuring clean ignition cycles

Robertshaw 1980-060 Thermocouple If the plunger is stuckUpgrade your gas fired systems with the Robertshaw 1980 060, a professional grade 60 inch snap fit thermocouple engineered for high performance pilot flame monitoring. This heavy duty gas furnace thermocouple features a resilient stainless steel outer jacket that prevents heat blistering in high ambient environments, while the internal copper and nickel alloy construction ensures superior electrical conductivity for consistent millivolt signaling.