Freezer Not Freezing

Step 1: Clean condenser coils

Condenser coils release refrigerant heat to the room. When covered in dust and pet hair, the compressor overworks and the system loses cooling capacity. Coils are at the back or beneath the unit — vacuum with a brush attachment and wipe clean. Should be done every 6-12 months.

Step 2: Check the door gasket

A leaking door seal lets warm, humid air into the freezer continuously — the compressor can't keep up and the freezer warms. Test: close the door on a dollar bill, half in and half out. Pull the bill — you should feel resistance. If it slides out freely, the gasket isn't sealing at that point. Test all four sides. A replacement gasket runs $20-50.

Step 3: Check the evaporator fan

The evaporator fan circulates cold air through the freezer compartment. Open the freezer door and hold in the door switch (tricks the unit into thinking the door is closed). You should hear the fan. If silent, the fan motor has failed ($20-40 to replace). Access through the back interior panel of the freezer.

Step 4: Check for defrost system ice-over

If the freezer was working fine and then gradually got warmer over 2-4 weeks, the defrost system has likely failed and ice has built up on the evaporator coils, blocking airflow. Symptoms: ice visible when you remove the back freezer panel, freezer warm but compressor running constantly.

Force-defrost the unit: unplug for 24-48 hours with the doors open (put a towel on the floor). If it cools normally afterward, the defrost system is the issue — check the defrost heater, defrost thermostat, and defrost timer/control board.

Freezer temperature targets

Freezer should maintain 0°F (-18°C). Food stays safe at 0°F indefinitely. At 10°F, ice cream softens but food remains frozen. Above 20°F, frozen food quality degrades rapidly. Use a thermometer — don't rely on the display.

Frequently asked questions

My freezer is cold but not cold enough (runs around 15-20°F). What's wrong?

This is usually a defrost system issue (partial ice-over reducing airflow), a door seal leak, or dirty condenser coils reducing efficiency. Check all three — the coils and door seal are free checks. A partially iced evaporator might only reduce cooling by 10-15°F rather than stopping it completely.

Food in my freezer has frost/freezer burn despite being sealed. Related?

Frost burn from excessive ice crystals inside packaging often indicates temperature fluctuations — the freezer is cycling above 0°F during off-cycles. This points to a door seal leak or a failing defrost system that's causing the freezer to over-defrost.

My chest freezer isn't freezing but the motor runs. What's the issue?

Chest freezers rarely have evaporator fan issues (they use natural convection). Focus on condenser coils (underneath or behind the unit), door/lid seal, and refrigerant level. If coils and seal are fine and the compressor runs constantly without cooling, refrigerant may be low — requires a technician.

Related guides

• Refrigerator Not Cooling
• Refrigerator Leaking Water
• Ice Maker Stopped Working

Last updated June 2, 2026. Repair procedures and part prices verified against manufacturer documentation and current market pricing. Confirm prices at time of purchase.