Possible Causes

Defrost heater not working on fridge evaporator (if separate), Faulty evaporator sensor, Blocked air return vents, Door left open frequently

How to Fix / Troubleshooting

Safety: Unplug the appliance before removing panels. Avoid sharp tools on plastic or aluminum surfaces.

Steps:

Manual defrost: Empty the fridge, unplug, and leave the door open until all ice on the back wall melts.
Check vents: Ensure that air vents at the back and sides are not blocked by food containers.
Inspect evaporator sensor: Remove the rear inner panel (if accessible) and verify the sensor is properly attached to the evaporator. Replace if damaged or out of spec.
Monitor usage: Avoid leaving the door open for extended periods and ensure the door closes fully after each use.

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