Amana Dryer Error Code oP

The OP code means the control board is detecting an open circuit in the thermistor, the temperature sensor inside the dryer. This can be caused by a broken or loose wire in the thermistor circuit, a failed thermistor, or ambient temperatures dropping below 10°F near the sensor. On some Amana controls, this same fault displays as 'oF' instead of 'OP'.

Start by disconnecting power to the dryer, then remove the front panel to access the thermistor wiring. Inspect all wires and connectors between the thermistor and the control board for breaks, burns, or loose terminals. If wiring looks intact, use a multimeter to measure resistance across the thermistor terminals; if the reading is infinite or far outside the expected range (around 10,000 ohms at room temperature), replace the thermistor. If both the wiring and thermistor check out, the control board may need replacement.

Yes. If the temperature near the thermistor drops below 10°F, the sensor's resistance rises to a level the control board reads as an open circuit, triggering the OP or oF code. This is common in unheated garages during winter. Move the dryer to a warmer location or heat the space above 10°F, then restore power to see if the code clears on its own before assuming a component has failed.

You should not continue running the dryer with an active OP code. The thermistor is the primary temperature sensor the control board uses to prevent overheating. Without a valid temperature reading, the dryer cannot regulate heat safely, which creates a potential fire hazard. Stop using the dryer until the fault is diagnosed and resolved.

If the fix is just reseating a loose connector, there is no parts cost, only your time. A replacement thermistor for an Amana dryer typically costs between $10 and $30 for the part. A control board is significantly more expensive, ranging from $100 to $250 or more depending on the model. If you hire a technician, expect a diagnostic fee plus labor, which usually runs $80 to $150 on top of parts costs.