Why Is My Fridge Freezer Temperature Unstable?
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A few degrees of variation is normal as the compressor cycles on and off. But wide swings or consistently wrong temperatures point to a fault.
Common Causes
Door Seal Failure
Warm air leaking in causes the compressor to work harder and temperatures to vary. Check the seal by closing the door on a piece of paper — it should grip firmly.
Thermostat or Sensor Fault
A faulty thermostat calls for cooling at the wrong times. Replacement cost: £70–£130.
Overfilling or Underfilling
Both extremes reduce airflow and affect temperature stability. Leave space for air to circulate.
Defrost System Fault
On frost-free models, a failed defrost heater or timer causes ice to build up on the evaporator, reducing efficiency over time.
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