Replacing the defective HVAC thermistor with this OEM part typically resolves sensor-related fault codes

it meets the EIA-456-A test standards

Most failures stem from loose wire connections leading to localized resistance and thermal pitting

It serves as a direct cross-reference for 96-TD163S

Reznor 121866 Thermal Switch Replacing the defective HVAC thermistorFor veteran contractors servicing industrial heating equipment, the Reznor 121866 Thermal Switch is a critical OEM component designed for high precision fan control and limit protection. This F190 30F thermal thermostat is engineered to monitor internal cabinet temperatures, ensuring the blower activates only when the heat exchanger reaches an optimal 190F. By deactivating the blower once temperatures drop below 30F, this switch prevents the