Amana Washer Error Code OP

The OP code means the thermistor in the water mixing valve is reading a temperature below 10°F, or the thermistor circuit is open. This is almost always a sensor or wiring fault rather than an actual freezing condition. The washer will not operate normally until the issue is diagnosed and corrected.

No, the washer will typically halt operation when the OP code is active because the control board cannot reliably manage water temperature without a valid thermistor reading. Attempting to bypass or ignore the fault is not recommended, as the machine may not fill or heat correctly depending on the selected cycle.

If the fix is simply reseating a loose connector, there is no parts cost involved. Replacing the thermistor or mixing valve assembly typically costs between $20 and $120 in parts depending on the component required. Adding professional labor, the total repair cost generally falls in the range of $100 to $250.

Many DIYers can resolve this code by checking and reseating the thermistor wiring connector at the water mixing valve. If the connector looks good, testing the thermistor with a multimeter and replacing it if it reads open is a straightforward repair. However, if the control board or wiring harness is involved, the repair becomes more complex and may benefit from professional assistance.

A reset may temporarily clear the code and allow a cycle to start, but the fault will return if the underlying issue with the thermistor or its wiring has not been corrected. Resetting is useful as a quick check after completing a repair, but it is not a fix on its own.