The short answer
A static European freezer has no fan and no defrost heater, so frost is not a symptom on this platform — it is the mechanism. Ranked first on this platform: Frost build-up blocking the evaporator. The checks below follow that ranking, and the first of them need no tools and no panel removed.
What you observe
- A thick sheet of frost on the rear panel or the coil, with the cabinet still running — Cold being made and not delivered is the definition of this fault.
- Frost building along one part of the door or lid line — Frost marks the entry point of the leak as reliably as smoke marks a draught.
- The temperature is consistently a few degrees high and stays there — Consistency points at the control rather than at the capacity.
- NEAR MISS — the freezer is fine and only the refrigerator side is warm — On a combined cabinet that points at the air path between compartments rather than at the refrigeration.
Causes, most likely first on this platform
- Frost build-up blocking the evaporator — Ice on the evaporator is an insulator between the coil and the air. It ranks first on this platform because the compartment is cooled by plates that frost during every run, and with nothing to clear them but the owner, that frost thickens until the plates are insulated from the air they are supposed to be cooling.
- A door or lid seal that has stopped sealing — A freezer has a bigger temperature difference across its door than any other appliance in the house, so a seal that leaks costs it more. It ranks second here because static cooling means cold falls and warm rises inside the cabinet with nothing to move it, so temperature is a function of where in the box you measure and how the shelves are packed.
- The control set wrong or reading wrong — A control that has drifted holds the cabinet steadily at the wrong temperature. That steadiness is the clue: a mechanical or sensing fault gives a consistent wrong answer, where a refrigeration fault usually gives a worsening one. It comes third in the order — a genuine cause here, behind the ones above it on frequency alone.
Check in this order, and why
- Look behind the rear panel or at the exposed coil for a solid sheet — It separates an airflow fault from a refrigeration one without tools. It leads because it tests the top-ranked cause.
- Close the door on a slip of paper at a dozen points round the frame — It maps the seal in two minutes with nothing but a piece of paper. Tests the second-ranked cause.
- Read the cabinet with a thermometer rather than trusting the dial or the display — The dial reports what was asked for, not what happened. Tests the third-ranked cause.
What an owner can safely check
- Empty the cabinet, switch it off and let it defrost completely with the door open — Towels on the floor, and let it melt rather than helping it with anything hard.
Tools: towelAbout 30 min
- Clean the gasket with warm soapy water, dry it and repeat the paper test — Also look for a hinge that has dropped, which produces the same result at the bottom of the door.
Tools: clothAbout 20 min
- STOP before anything behind a fixed panel, and note what each check showed — Everything past this line is measured rather than looked at, and measuring it safely needs the power off and a meter.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off.
When to call a technician
Call once the door, the airflow and the condenser are all clean and the cabinet still drifts, because what remains is a defrost circuit or a sealed system and both are measured rather than looked at.
Nearest pages of this class
What this page does not cover
This page is written for the Mora freezer as a class, not for one family or one model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer and the one to read first. Deliberately not here: part numbers, wiring colours and disassembly order, which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
