A technician should check for continuity across the terminals when the furnace is cool

keeping the lead clear of burner interference

While both are 10

With power disconnected and the part at room temperature

With a mechanical life rating of 10 million cycles and an integrated LED status indicator

Bard 8402-019 Thermal Cutoff A technician should check forThe Bard 8402 019 Thermal Cutoff is a critical safety component designed for HVAC high limit protection. This 128C thermal fuse link serves as a non resettable safety device that monitors ambient temperatures within the cabinet or heater assembly. When the Bard replacement part detects a temperature excursion exceeding its 128 degrees Celsius rating, it opens the electrical circuit to prevent equipment damage and potential fire hazards. This thermal