## How to Fix Whirlpool Error F28 (Moisture Sensor Open)
If your Whirlpool washing machine (or combination unit) displays the “F28” error code, it indicates a specific communication failure related to moisture detection. While this might seem like a complex electronic issue, it often points directly to a failing or obstructed sensor component.
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### Explanation: What does the F28 code mean?
**F28 stands for “Moisture Sensor Open Circuit.”**
In plain English, this means the main control board is not receiving the expected electrical signal from the moisture sensor. The circuit is “open,” suggesting a complete break in communication.
**The likely culprit is the: Dryer Moisture Sensor.**
Although the error appears on the washing machine display, it typically relates to the **dryer cycle** or the **dryer section** of a combination unit. The machine relies on this sensor to determine the clothes’ dryness level and stop the cycle. When the sensor fails, the unit shuts down and displays F28 to prevent potentially infinite running or overheating.
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### Step-by-Step Fix: How to Diagnose and Replace the Dryer Moisture Sensor
Follow these steps to safely diagnose the issue and replace the faulty sensor.
#### **STEP 1: Safety First (Unplug the Machine)**
* **Crucial:** Before performing any inspections or repairs, unplug the Whirlpool appliance completely from the wall outlet. Do not rely on turning off the circuit breaker alone.
#### **STEP 2: Initial Inspection (Obstruction Check)**
Sometimes, the sensor is simply covered or shorted by lint or debris, mimicking an open circuit error.
1. **Locate the Sensors:** On most Whirlpool dryers or combo units, the moisture sensors are two parallel metal strips located inside the dryer drum, usually positioned near the lint screen housing.
2. **Clean the Strips:** Use a soft cloth (or a cotton swab dipped in rubbing alcohol) to thoroughly clean the metal strips. Ensure there is no dryer sheet residue, lint buildup, or corrosion obstructing them.
3. **Test:** Plug the unit back in and attempt a short drying cycle. If the error persists, proceed to Step 3.
#### **STEP 3: Accessing the Sensor Wiring**
You will need to access the area where the sensor connects to the main wiring harness. This usually involves removing the lower front panel or the rear access panel of the unit.
1. **Access:** Remove any necessary screws or clips securing the front or rear panels. (Consult your owner’s manual for specific panel removal instructions for your model.)
2. **Trace the Wires:** Locate the wires running from the metal sensor strips. These wires connect to a small connector plug.
#### **STEP 4: Testing the Sensor (Continuity Check)**
You will need a multimeter capable of measuring Ohms (resistance) to confirm the sensor is faulty.
1. **Disconnect:** Unplug the wiring harness connector from the moisture sensor circuit board.
2. **Measure Resistance:** Set your multimeter to the Ohms (Ω) setting. Place the multimeter probes onto the two terminals on the sensor’s side of the connector plug.
3. **Analyze Results:**
* **Good Sensor:** You should measure a very low resistance reading, typically near **0 to 1 Ohm**. This indicates the circuit is closed and functioning correctly.
* **Bad Sensor (F28 Confirmed):** If the multimeter shows **”OL” (Over Limit)** or **Infinite Resistance**, the circuit is open. This confirms the moisture sensor assembly has failed and must be replaced.
#### **STEP 5: Replacing the Sensor Assembly**
The moisture sensor is typically replaced as a single assembly, which includes the sensor strips and the small circuit board they attach to.
1. **Remove the Old Sensor:** Unscrew or unclip the faulty sensor assembly from its mounting location (usually inside the blower housing or near the lint screen duct).
2. **Install the New Sensor:** Carefully install the new replacement sensor assembly, ensuring the metal strips are positioned correctly within the drum.
3. **Reconnect:** Reattach the wiring harness securely to the new sensor connector.
4. **Reassemble and Test:** Reassemble the panels, plug the appliance back into the wall, and run a test drying cycle to confirm the F28 error is resolved.
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