Frost or ice on the freezer walls, around the vents, or behind the panels usually means the defrost system is not clearing ice the way it should. Left alone, the buildup chokes airflow and warms the refrigerator side.
Notes by Brand
The same symptom can have different causes depending on the brand. Here is how we approach freezer frost buildup across the roster.
Sub-Zero
Ice on the evaporator points to a defrost heater, sensor, or control fault on that sealed system. We test the defrost circuit directly.
Bosch
Frost buildup often traces to a door seal letting humid air in, or to a defrost fault. We check the gasket and the defrost circuit.
Miele
A defrost or sensor fault can drive the buildup. We test the heater, the sensor, and the door seal.
Liebherr
Ice buildup can ride along with a sensor fault or a defrost issue. We measure the sensor and test the defrost system.
Viking
We check the door seal first, then the defrost heater and sensor. A weak gasket pulls in humid air.
True Residential
A defrost-circuit fault lets frost choke the evaporator. We test the heater, sensor, and control.
Kitchenaid
Frost buildup points to the defrost heater, the defrost thermostat, or a door-seal leak.
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Indications and What We Check
| Symptom | Likely Cause | What We Check |
|---|---|---|
| Ice on the evaporator | A defrost heater or sensor fault | Test the defrost heater, sensor, and control |
| Frost around the door | A worn or misaligned gasket | Inspect and replace the gasket, align the door |
| Vents iced over | A defrost-cycle or airflow fault | Check the defrost timing and the airflow |