Amana Dryer F23 Error Code — What It Means
The F23 error code on an Amana dryer signals a problem with the outlet thermistor circuit. This thermistor is the sensor that measures exhaust temperature and reports it back to the main control board. When the board detects an open circuit, a short, or an out-of-range resistance reading from that sensor, it throws F23 and stops the dryer. Amana recommends a power reset as a first step, but if the code returns the underlying fault is almost always hardware: a failed thermistor, damaged wiring between the sensor and the control board, or a failed control-board input circuit.
Common Causes
- Failed outlet thermistor The exhaust temperature sensor itself has gone open, shorted, or drifted out of the acceptable resistance range.
- Damaged or loose wiring and connectors The harness or terminals between the thermistor and the main control board are broken, corroded, or making intermittent contact.
- Failed main control board sensor input The circuit on the control board that reads the thermistor signal has failed even though the sensor and wiring test correctly.
- Intermittent connection under heat A connector or crimp that looks fine when cold opens up when the dryer heats, causing the fault only during operation.
Step-by-Step Fix
- Perform a full power reset by switching off the dryer circuit breaker for at least one minute, restoring power, and running a timed dry cycle to see if F23 returns.
- Access the outlet thermistor by unplugging the dryer and removing the rear panel or top cabinet access to reach the exhaust duct area where the sensor mounts.
- Inspect the thermistor and its harness for visible damage, corrosion, or loose connectors, and verify that both wires are firmly seated at the sensor and at the control-board connector.
- Disconnect the thermistor leads and measure resistance across the sensor terminals with a multimeter at room temperature. Technician references for similar Whirlpool-family dryers cite roughly 10,000 to 12,000 ohms, but consult your model’s service sheet for the exact specification.
- Check harness continuity from the thermistor connector all the way to the control-board pins if the thermistor resistance is within range, looking for broken wires or poor crimps.
- Replace the outlet thermistor if your ohm reading is open, shorted, or clearly outside the acceptable window for your model.
- Replace the main control board only after confirming that the thermistor and all wiring test good, since the board’s sensor-input circuit is the next most common failure point.
Parts Often Needed
| Part | Notes |
|---|---|
| Outlet thermistor (exhaust temperature sensor) | Amazon | Use your dryer’s full model number to find the correct replacement sensor for your Amana platform. |
| Thermistor wire harness or repair terminals | Amazon | Order if wiring continuity is bad or connector terminals are damaged beyond repair. |
| Main control board (electronic control board) | Amazon | Replace only if the thermistor and harness both test correctly but F23 persists after power cycling. |
When to Call a Pro
Call a professional if you are not comfortable working with a multimeter, accessing internal dryer components, or interpreting resistance readings. The diagnostic process requires isolating the thermistor circuit and testing both the sensor and the harness under the correct conditions. If you replace the thermistor and wiring but F23 still returns, the control board is the likely culprit and that swap involves handling the user interface and all harness connections. A qualified appliance technician will have model-specific resistance specifications, the correct replacement parts on the truck, and the experience to avoid misdiagnosis.