Amana Dryer F22 Error Code — What It Means
The F22 code on your Amana dryer signals a thermistor or temperature-sensing circuit fault. The dryer’s control board is not receiving the expected signal from the thermistor, so it cannot trust the temperature feedback. This may cause the machine to shut down heating or stop the cycle altogether to prevent unsafe operation.
In practical terms, the control thinks the thermistor circuit is open, shorted, or otherwise invalid. The thermistor is a small sensor located near the exhaust outlet or air discharge path that tells the control how hot the air is. When that signal is missing or wrong, the dryer cannot regulate heat safely.
Common Causes
- Failed thermistor The temperature sensor itself has worn out, drifted out of specification, or failed internally.
- Loose or corroded wiring connectors Terminals at the thermistor or machine control are loose, oxidized, or making poor contact.
- Damaged wire harness The harness between the thermistor and control board is pinched, broken, or shorted.
- Open or shorted thermistor circuit A break or short anywhere in the two-wire circuit prevents the control from reading valid resistance.
- Machine control board fault If the thermistor and wiring test correctly but the fault returns, the control board itself may have a failed input circuit.
Step-by-Step Fix
- Disconnect all power by switching off both circuit breakers (for 240 V dryers) or unplugging the machine, then wait at least two minutes before opening any panels.
- Remove the rear or front panel (consult your model’s service manual) to access the blower housing and exhaust area where the thermistor is mounted.
- Inspect all connectors at the thermistor and at the machine control board for loose pins, corrosion, or damaged terminals, then reseat each connector firmly.
- Locate the thermistor near the exhaust outlet or on the blower housing, disconnect its two-wire plug, and use a multimeter set to ohms to measure the thermistor’s resistance.
- Compare the reading to the resistance table in your model’s service sheet (typical thermistors change resistance with temperature), and flex the harness gently while watching for intermittent or open readings.
- Replace the thermistor if the resistance is out of range, reads open (infinite), reads zero (shorted), or jumps erratically when you move the wires.
- Reassemble the dryer, restore power, and run a timed dry cycle to verify that heating resumes and the F22 code does not return.
Parts Often Needed
| Part | Notes |
|---|---|
| Dryer thermistor / temperature sensor | Amazon | Verify the exact part number for your Amana model (some Whirlpool-family dryers use WP8577274, but confirm compatibility first). |
| Wire harness repair kit or replacement connectors | Amazon | Use only if you find damaged or burned terminals that cannot be cleaned and reseated. |
| Dryer electronic control board (machine control) | Amazon | Order only after confirming the thermistor and wiring are good but the fault persists. |
When to Call a Pro
Call a qualified appliance technician if you are uncomfortable working inside a 240 V dryer, if you do not own a multimeter or cannot interpret resistance readings, or if the thermistor and all wiring test correctly but the F22 code returns after reassembly. Also call for help if the control board shows signs of heat damage or if you need the manufacturer resistance table for your exact model and cannot locate it in the service documentation.