When a fridge freezer alternates between too warm and too cold, it creates frustration and risks food spoilage. Fluctuating temperatures are usually caused by inconsistent airflow, faulty sensors, or component malfunctions rather than a total appliance failure.
Common causes
Faulty temperature sensor
If the sensor misreads the temperature, the compressor may cycle on and off at the wrong times, causing swings in cooling.
Replacement costs £60–£150.
Damaged damper or vent control
The damper regulates airflow from the freezer to the fridge. If it sticks open or closed, cold air distribution becomes irregular, causing fluctuations.
Repair costs £70–£150.
Blocked evaporator fan or vents
Ice buildup or blocked vents prevents proper air circulation. Cold air accumulates in some areas while other shelves remain warm.
Cleaning or repairing the fan usually costs £80–£200.
Overloading the fridge
Packing the fridge too tightly reduces airflow, causing uneven temperatures. Simply reorganizing shelves often solves the issue.
Signs you need professional help
- Food spoils unevenly
- Freezer ice buildup is noticeable
- Fridge temperature swings despite adjusting thermostat
- Compressor runs constantly or erratically
Related problems
Get a repair quote
Professional engineers can test sensors, fans, and damper systems to restore stable temperatures throughout the fridge freezer.
Visit our homepage to get free local repair quotes.