Why is my freezer not staying frozen?
A freezer that runs but drifts warm has usually lost airflow or is fighting a failing start component. A freezer should sit at about −18°C; anything consistently above −12°C means food quality is degrading even if nothing is visibly thawed.
Likely causes
- Condenser coils blocked with dust, so heat cannot escape
- Evaporator fan seized on upright models
- Start relay or capacitor failing, so the compressor cannot run properly
- Door seal letting warm air in continuously
- Thermostat or thermistor out of range
What we do
We log the actual internal temperature against the setting, check current draw at the compressor and inspect the coils. On chest freezers we also check the drain plug seal, which people rarely think about and which lets in a surprising amount of warm air.
What affects the cost
Coil cleaning, seals and relays are the low end. Sealed-system work on an older freezer is where replacement usually wins, and we will say so.



