Excessive frost or ice build-up in freezer; drawers difficult to open; frost on door gasket.

Safety first: Unplug the appliance before adjusting doors or inspecting heaters.

Steps:

• 1. Inspect door gasket: Look for tears, gaps, or hardened sections. Clean the gasket with warm soapy water to improve sealing.
• 2. Check door alignment: Ensure the door closes evenly and is not sagging. Adjust hinge screws if necessary so the gasket contacts the cabinet all around.
• 3. Defrost fully: Turn off and unplug the refrigerator, leave doors open, and allow all ice to melt. Place towels to catch water.
• 4. Verify defrost operation: After restarting, monitor for new frost. If heavy frost returns quickly, test the defrost heater, thermostat, and sensor as described in defrost fault procedures.
• 5. Replace gasket or defrost components: Install new Siemens door gaskets or defrost parts if found defective.

Tip: Avoid leaving the freezer door open for extended periods, especially in humid environments.