Whirlpool Washer Error Code 15

Error code 15 on a Whirlpool washer means the tub water thermistor is invalid, indicating the control board is not receiving a valid signal from the water temperature sensor. The thermistor may be disconnected, missing, or failed. The washer requires this sensor to properly regulate water temperature during wash cycles. Running service mode test 8 is the first step to confirm whether the thermistor is within specification.

Running the washer with an active error code 15 is not recommended. Without valid water temperature data, the control board cannot properly manage cycle temperatures, which could result in inadequate cleaning or incorrect cycle operation. It is best to diagnose and repair the fault before resuming normal use.

Resetting the washer may temporarily clear the error code display, but the fault will return as soon as the control board attempts to read the thermistor again and receives an invalid signal. A reset does not fix the underlying problem. The thermistor circuit must be inspected and repaired for the code to clear permanently.

A knowledgeable DIYer can often resolve this fault by locating and reconnecting a loose wiring harness connector at the thermistor, which requires no parts. If the thermistor itself has failed, replacing the sensor is a moderately straightforward repair involving disconnecting the old sensor and installing a new one. However, accessing the thermistor may require partial disassembly of the machine, so comfort with appliance repair is recommended.

If the repair is simply reseating a loose connector, there is no parts cost involved. If the thermistor needs replacement, parts typically range from around $15 to $50 depending on the specific model. If a professional technician is needed, total repair costs including labor can range from $100 to $250 or more depending on your location and the extent of the diagnosis required.