Error code · Liebherr
BT021 · Appliance malfunction error
The appliance is faulty, indicating an error with the device or its components. Check the cooling products and ensure they are properly stored.
Fridge freezerCaution — Know When to StopFixLens verified
Safe first steps
- Check that the fridge and freezer doors are fully closed.
- Inspect the temperature settings to ensure they are set correctly.
- Ensure that the cooling products are not blocking the air vents inside the fridge and freezer.
- If the error persists after checking the above, consider unplugging the appliance for a few minutes and then plugging it back in.
- If the appliance still shows the error after resetting, arrange a service visit — do not use the appliance.
When to stop
- Stop if you notice unusual noises or if the appliance is excessively hot — risk of component damage.
Likely cause
The appliance is faulty, indicating an error with the device or its components. Check the cooling products and ensure they are properly stored.
Verification
Reviewed by: automated manual extraction
Verified against Liebherr UWpri 3661_994822551 technical documentation
FixLens publishes its own structured technical logic verified against Liebherr UWpri 3661_994822551 documentation · last verified April 23, 2026.
Official manufacturer support