Why does my blender jar wobble on the base?

If the blender jar wobbles, it may not be seated correctly, the base may be uneven, or the non-slip feet may not be gripping properly. Stop using the appliance if the wobble is strong, the jar is cracked, or the unit is slipping on the worktop.

1. Switch off and unplug the blender. Expected result: the appliance should be fully still before you inspect it.
2. Place the base on a flat, dry surface and check the non-slip feet. Expected result: the blender should stand level and stable.
3. Remove and refit the jar so it locks into place properly. Expected result: the jar should sit straight without sideways movement.
4. Check for dried residue, uneven wear or damage at the jar base and coupling point. Expected result: the contact surfaces should be clean and intact.
5. Test again with a small amount of ingredients. Expected result: the jar should remain steady during operation.

Stop using the blender if the wobble continues after correct refitting or if any part looks damaged. If the issue remains unresolved, contact the retailer or store where it was purchased. The Tristar BL-4431 has non-slip feet and a removable jug, so a flat surface and correct locking position are important for stability.