Whirlpool Washer Error Code 364

Error code 364 indicates an Air Outlet Temperature Sensor Fault, specifically involving the NTC 4 sensor in the heat pump system. The control board has detected a resistance reading from this sensor that falls outside the acceptable range. This can interrupt drying cycles and requires diagnosis of the sensor, its wiring, and the heat pump system. The recommended starting point is running service mode test 15, the Heat Pump System Test, to full completion.

Continuing to run the washer with code 364 active is not recommended. The heat pump system relies on accurate temperature data from NTC 4 to operate within safe parameters, and an unresolved sensor fault can lead to improper temperature regulation. It is best to diagnose and resolve the fault before resuming normal use to avoid potential damage to the heat pump assembly.

A power reset may temporarily clear the code from the display, but if the underlying sensor fault or wiring issue has not been corrected, the error will return during the next cycle. A reset alone is not a repair. Running service mode test 15 and addressing the identified fault is necessary to permanently resolve code 364.

Some causes of code 364 are DIY-friendly, such as reseating a loose connector or inspecting wiring for visible damage. However, accessing the heat pump components and running service mode test 15 requires familiarity with washer diagnostics and disassembly. If the sensor itself needs replacement or the fault points to the heat pump system or control board, a technician with the proper tools and training will be better equipped to complete the repair safely.

Repair costs vary depending on the root cause. Replacing the NTC 4 temperature sensor alone typically ranges from around 20 to 60 dollars for the part, plus labor if a technician is involved. If the wiring harness or control board needs replacement, costs can range from 100 to 350 dollars or more including parts and labor. A proper diagnosis through service mode test 15 is the best way to avoid unnecessary part replacements.