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The Bard 8408-040BX outlet thermistor is an OEM temperature sensor used in Bard wall mounted HVAC equipment to monitor outlet air or coil related temperatures and report that information back to the control board for stable, safe operation. When an outlet thermistor drifts out of tolerance or fails open or short, you can see nuisance faults, incorrect staging, poor temperature regulation, or defrost and freeze protection issues depending on the model, so replacing it with the correct Bard sensor helps restore proper control logic and system performance. This is a genuine Bard replacement part supplied boxed, and it is intended to match factory fit and electrical characteristics for straightforward service replacement when verified against your unit model and wiring diagram.
* Orders less than $50 may incure a minimum order fee.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.