Quick Answer
If your refrigerator is running constantly, check the temperature setting, door seals, blocked vents, warm food loads, dirty condenser coils, and clearance around the appliance. It may also run nonstop because of a failed fan, defrost problem, thermostat, thermistor, control board, refrigerant leak, or weak compressor. Stop DIY checks if you hear clicking, smell burning, see heavy frost, or the refrigerator cannot keep food cold.
Symptoms at a Glance
Compressor never shuts off
Likely cause: Dirty coils, weak door seal, warm room, bad thermostat, or cooling issue.
Homeowner action: Clean coils and check gaskets.
Fridge runs constantly but feels warm
Likely cause: Fan failure, defrost issue, sealed-system problem, or weak compressor.
Homeowner action: Move food to a cold location and schedule service.
Freezer has frost on the back wall
Likely cause: Defrost heater, sensor, timer, drain, or control problem.
Homeowner action: Do not chip ice from panels. Book diagnosis.
Compressor clicks on and off
Likely cause: Start relay, overload, capacitor, compressor, or electrical issue.
Homeowner action: Stop cycling the unit and call a technician.
Repair Difficulty Meter
DIY difficulty: Low for settings, airflow, gasket cleaning, and coil cleaning.
Estimated time: 15-45 minutes for safe homeowner checks.
Tools needed: Appliance thermometer, flashlight, vacuum, coil brush, and mild soap.
Safety risk: Moderate because refrigerators use electricity, moving fans, sharp panels, and refrigerant lines.
When to call a professional: Call when cooling is poor, frost returns, fans are silent, the compressor clicks, the breaker trips, or sealed-system failure is possible.