Kenmore Washer Error Code E66

E66 indicates a problem with the water temperature sensor circuit. The washer's main control board is detecting a signal from the thermistor that falls outside the acceptable range. This can result from wiring issues, corroded connectors, or a failed thermistor. The washer may stop operating until the fault is resolved.

It is not recommended. The E66 code means the washer cannot reliably monitor water temperature, which could lead to water that is too hot or a heater that runs without proper control. Running the machine in this state risks damage to fabrics and potentially to internal components. Resolve the fault before resuming normal use.

Repair costs vary depending on what component has failed. If only a connector needs cleaning or reseating, the cost may be minimal. Replacing a thermistor typically involves a parts cost in the range of $15 to $50, plus labor if a technician performs the work. If the main control board is at fault, parts and labor combined can range from $150 to $350 or more.

In many cases, yes. Start by unplugging the washer and inspecting the wiring and connectors between the control board and the heater or thermistor assembly. Reseating loose connectors or cleaning corroded terminals often clears the code. If the thermistor has failed, replacing it is a straightforward repair for someone comfortable with basic appliance work.

A reset may temporarily clear the code from the display, but if the underlying fault in the temperature sensor circuit is still present, the code will return once the washer attempts to operate again. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause.