Panasonic Washing Machine Error U99

⚡ Quick Answer: The U99 error code on your Panasonic washing machine indicates that the Child Lock or Control Lock feature has been activated. This often results in t... ✅ DIY Fixable

What Does Error U99 Mean?

The U99 error code on your Panasonic washing machine indicates that the Child Lock or Control Lock feature has been activated. This often results in the door remaining locked and the machine failing to start or complete its wash cycle. If the lid is opened during operation, the machine will automatically drain water as a safety measure. To resolve this issue, ensure the lid is securely closed, disable the Child Lock feature, and reset the machine.

Common Symptoms:

  • U99 displayed on control panel during or after wash cycle
  • Automatic forced drainage of water after lid open during operation
  • Machine stops mid‑cycle and does not resume until reset

Possible Causes

  • Child safety lock (Child Lock / Control Lock) active and washing lid/door opened during cycle (high)

How to Fix Error U99

DIY Fix Disable Child Lock and Reset Error

  1. Ensure the washing machine lid/door is fully closed.
  2. Turn off the Child Lock / Control Lock feature (e.g., hold designated button such as 'Child Lock' or 'Tangle Care' for ~5 seconds as per model instructions).
  3. Unplug the washing machine for ~10–15 seconds and plug back in to clear the U99 code.
  4. Restart a wash cycle ensuring Child Lock is not active if not needed.

Technician Only Verify Child Lock Switch and Lid Sensors

  1. Check that lid/door switches and sensors are functioning and not sticking.
  2. Verify that the control panel correctly activates/deactivates the Child Lock feature.
  3. Test cycle operations with and without child safety features engaged.
  4. Inspect wiring associated with Child Lock controls and latch sensors.

Parts needed: Door/Lid switch assembly, Control panel or board connections (for Child Lock circuitry)

🛑 When to Call a Pro:
  • U99 persists after disabling Child Lock and proper reset
  • Lid/door switch seems faulty or fails to register closed position
  • Repeated erratic error codes accompany U99, suggesting control board issue

Next step

Choose the next step for U99

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Door or Lid Switch

Detects whether the appliance door or lid is safely closed before operation.

Typical part-only price
$15 - $55
DIY difficulty
Medium
Estimated time
20-45 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Technical Specifications

wattage N/A
component Door Lock Assembly
resistance 1-5 ohms
part_number N/A
voltage_rating 120V AC

Common Questions

What does U99 error mean on Panasonic Washing Machine?

The U99 error indicates the Child Lock feature is activated, preventing normal operation.

Can I fix Panasonic Washing Machine U99 error myself?

Yes, you can disable the Child Lock and reset the machine as detailed in the DIY actions.

How much does it cost to fix U99 error?

Repair costs for the U99 error are typically low to moderate, depending on parts needed.

When should I call a technician for U99?

Call a technician if the U99 error persists after resetting or if the lid switch appears faulty.

Sources & References

Data last verified: 2026-07-22

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