# How to Fix Whirlpool Error F22 (Outlet Thermistor Open)
The F22 error code is a thermal sensing fault that affects many newer Whirlpool appliances, particularly combination units or models with heated drying cycles. This guide will help you understand what the code means and how to quickly diagnose and fix the problem.
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## Explanation: What Whirlpool Error F22 Means
In plain English, the F22 error code signifies an **“Outlet Thermistor Open”** circuit.
**What is a Thermistor?**
A thermistor is a highly sensitive resistor that measures temperature. It reports back to the main control board (CCU). Your machine uses it to monitor the temperature inside the appliance, ensuring safety, preventing overheating, and controlling drying/heating cycles accurately.
**What does “Open” mean?**
An “open” circuit means the electrical path has been broken. The control board is not receiving any temperature data from the sensor.
The most common cause for this specific F22 fault is a failure of the **Dryer Thermistor** itself, which either shorted out or became physically disconnected.
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## Step-by-Step Fix: Diagnosing and Replacing the Dryer Thermistor
**⚠️ Safety First:** Always unplug the washing machine from the power outlet before beginning any inspection or repair work.
### Step 1: Access the Thermistor
The Dryer Thermistor is typically located near the heating element assembly, which is usually found on the back of the unit, often within the blower housing (if it’s a combo unit) or near the drum heater.
1. **Unplug the unit.**
2. **Gain Access:** Depending on your model, you may need to remove the rear access panel or the lower toe kick panel.
3. **Locate the Component:** Identify the thermistor. It is usually a small plastic or ceramic sensor with two wires running to it.
### Step 2: Perform a Visual Inspection (The Quick Fix)
Before using specialized tools, always check for simple issues:
1. **Check Wiring:** Inspect the wires leading to the thermistor. Look for burnt spots, frayed insulation, or loose wires.
2. **Check Connection Plug:** Ensure the plug connecting the thermistor harness to the main control board or to the main wiring harness is securely seated. An improperly seated plug is a common cause for an “open” circuit error.
### Step 3: Test the Thermistor for Resistance (The Critical Diagnostic)
If the visual inspection yields no clear issues, you must use a multimeter to check the continuity and resistance of the thermistor.
1. **Set Multimeter:** Set your multimeter to the Ohms (Ω) setting, preferably in the 20k to 50k range.
2. **Disconnect Wires:** Disconnect the wire harness from the thermistor (you may need to detach the thermistor from the unit body, but keep it at room temperature).
3. **Measure Resistance:** Place the probes of the multimeter across the two terminals of the thermistor.
#### Expected Results:
| Condition | Multimeter Reading | Diagnosis |
| :— | :— | :— |
| **Good Thermistor** | A consistent Ohm reading (e.g., 10kΩ to 50kΩ) | The thermistor is likely functional. Check the wiring harness leading back to the control board instead. |
| **Faulty Thermistor** | **OL** (Over Limit/Open Loop) or **Infinite Resistance** | The thermistor circuit is open. **The part has failed and must be replaced.** |
| **Short-Circuited** | A reading near **0 Ohms** | The thermistor is shorted out. **The part has failed and must be replaced.** |
*Note: The exact resistance value varies by manufacturer and model, but the key is that it should read *some* resistance, not infinity.*
### Step 4: Replace the Faulty Thermistor
If your testing confirms the sensor is faulty (reading OL or 0 Ohms):
1. **Remove Old Sensor:** Detach the faulty thermistor from its mounting location (it may be screwed in or clipped onto the heating duct).
2. **Install New Sensor:** Install the replacement thermistor, ensuring it is seated securely.
3. **Reconnect:** Reattach the wire harness and reassemble the machine panels.
4. **Test:** Plug the unit back in and run a short cycle to confirm the F22 error has cleared.
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### Replacement Part
Check the price for a replacement Dryer Thermistor here: https://www.amazon.com/s?k=Whirlpool+Dryer+Thermistor&tag=trivian-20
Need a Replacement Part?
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