# How to Fix Whirlpool Error F70 (Communication Error)
The F70 error code on Whirlpool washing machines, particularly those that are part of a stackable laundry center or include integrated drying functions, indicates a critical issue preventing the appliance from operating safely or correctly.
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## Explanation: What Whirlpool Error F70 Means
The F70 code signifies a **communication error** between the major electronic components of your appliance.
In simple terms, the machine’s main computer—the Central Control Unit (CCU)—is trying to talk to another critical component but is receiving no response or garbled data.
### The Likely Culprit
In Whirlpool machines displaying the F70 code, the missing link is almost always the control board responsible for operating the dryer functions. This is known as the **Dryer Control Board** or the **User Interface (UI) Control Board**.
The F70 message means the CCU has determined that the Dryer Control Board is either faulty, disconnected, or completely failed, preventing the machine from proceeding with a wash or dry cycle.
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## Step-by-Step Fix: Diagnosing and Clearing Error F70
**Safety Warning:** Always unplug the machine from the power outlet before accessing internal components, inspecting wiring, or performing any repairs.
### Step 1: Perform a Hard Reset
Communication errors can sometimes be temporary glitches caused by minor power fluctuations. A hard reset may clear the error memory.
1. **Unplug** the washer/dryer unit completely from the wall outlet.
2. Wait a full **5 minutes** to ensure all residual voltage drains from the capacitors and control boards.
3. **Plug** the unit back in.
4. Attempt to run a cycle. If the F70 error immediately returns, proceed to Step 2.
### Step 2: Inspect Wiring Harnesses
A communication error often results from a loose connection or damaged wire harness rather than a failed board. You will need to access the rear or top panel of the machine, depending on your model (consult your owner’s manual for specific access points).
1. **Locate the Main Control Board (CCU):** This is usually in the rear or near the console panel.
2. **Trace the Wiring:** Identify the main ribbon cables or harnesses running from the CCU up toward the control console/dryer section.
3. **Check Connections:** Gently unplug and firmly re-seat all connections leading to the User Interface and Dryer Control Board. Look specifically for:
* Harnesses P10 and P2 (these are common communication harnesses).
* Any signs of corrosion, burned pins, or wires that have been chewed or rubbed raw.
### Step 3: Access and Inspect the Dryer Control Board
If the wiring appears secure, the Dryer Control Board itself is likely the source of the communication failure.
1. **Remove the Control Panel:** On most stackable Whirlpool models, the control panel (where the buttons and display are located) must be detached to access the control board underneath.
2. **Examine the Board:** Once you have access, visually inspect the Dryer Control Board for damage:
* **Moisture or Corrosion:** Water damage is a common cause of control board failure.
* **Burn Marks:** Look for small, brown or black scorch marks, particularly around the connection ports.
* **Puffed Capacitors:** Look for cylindrical components that appear swollen or have burst tops.
3. **Testing (If possible):** Unless you have a multimeter and specialized schematics, physically testing the board is difficult. Since the F70 is a specific communication failure, visual damage or replacement is the most practical diagnostic method for the homeowner.
### Step 4: Replace the Dryer Control Board
If the wiring is secured and the hard reset failed, replacing the Dryer Control Board is the necessary repair. This is the component the CCU is trying and failing to communicate with.
1. **Order the Correct Part:** Ensure you obtain the exact OEM (Original Equipment Manufacturer) replacement board specific to your machine’s model number. Whirlpool boards are not interchangeable between model types.
2. **Installation:** Carefully detach the old board, taking a photo of the wire layout beforehand if necessary. Install the new board, reconnecting all harnesses securely.
3. **Test:** Reassemble the machine panels, plug the unit back in, and attempt to run a full cycle to confirm the F70 error has been cleared.
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Check the price for a replacement Dryer Control Board here: https://www.amazon.com/s?k=Whirlpool+Dryer Control Board&tag=trivian-20
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