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On a Marathon refrigerator, a cabinet that runs without getting cold is most often no clearance around the cabinet, so it breathes its own hot air rather than a stalled defrost cycle icing the evaporator over. The airflow path comes first on a compact machine, because the design assumes clearances that a tight installation quietly removes. All three checks below are owner work, and not one of them needs a part.
What the owner observes
- The machine never switches off — Continuous running without reaching temperature is the same fault seen from the compressor's side.
- The cabinet is warm and the compressor is clearly running — The machine is working and losing, which is a different fault from one that has stopped.
- A sheet of frost on the rear wall of the freezer — Light frost is normal; a sheet you cannot see the panel through is not.
- NEAR MISS — it cools but the ice maker has stopped — That is an ice-production fault with cooling intact, and it has its own page.
Why this happens, likeliest first
- No clearance around the cabinet, so it breathes its own hot air — Every cabinet needs a gap behind and above to move heat away. Tight to a wall, boxed into a cupboard or wedged beside a cooker, it takes back the air it just heated. It leads because it is usually what actually changed: the machine did not get worse, the space around it did. The machines are chosen for tight spaces, so they are usually boxed in on at least two sides.
- A condenser coil blanketed in dust — The condenser throws the heat away, at the back or underneath behind a grille. Under dust and pet hair it cannot, so the machine runs continuously and still loses ground. It ranks here because it is quick to confirm and quick to fix, which earns it a place ahead of anything needing a panel off.
- A stalled defrost cycle icing the evaporator over — The evaporator sits behind the freezer's rear panel. When defrost stops clearing it, frost builds into a sheet, air stops passing through, and the fridge side warms while the compressor runs on. It is last of the internal causes because reaching the evaporator means a panel, and everything above needs no tools.
The order to check in
- Try to fit your hand behind and above the cabinet — If it does not fit, the machine is breathing its own exhaust and that has to be fixed first. First, because it is the likeliest to end the job.
- Look at the condenser at the back or behind the base grille — If you cannot see metal through the dust, you have found it. Second, once that is clean.
- Open the freezer and look at the rear panel — A frost sheet rather than a dusting settles it, and it is visible without a tool. Third, and by now the answer is usually in hand.
The owner-side checks
- Pull the cabinet out and give it a gap behind and above — No tools. Leave it a day before judging whether it worked.
About 15 min
- Unplug the cabinet and clear the condenser coil — Vacuum and a soft brush; pull the base grille off if the coil is underneath.
Tools: vacuum, soft brushAbout 25 min
- Empty the cabinet and leave both doors open for a full defrost — Towels and patience. If it cools properly afterwards, the defrost system is the cause and it will come back.
About 45 min
- STOP HERE and write down what each check showed — A technician arriving with the free causes eliminated fixes rather than repeats your work.
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. Never chip ice off an evaporator with anything metal: the tubing is thin-walled, and a puncture scraps the cabinet.
Where the owner fix ends
The line is the freezer's rear panel: everything in front of it is owner work and settles most of these faults, and behind it is a service call. On the food: a refrigerator holds food safely at 40 °F (4 °C) or below. On this brand the brand has a real parts channel behind it, which makes a proper diagnosis worth the effort.
Nearest pages of this class
What this page does not cover
This page is written for the appliance class, not for one Marathon model line. Where a family- or model-specific page exists it is the better answer and it is linked below — go there first if your model is named. Not here: vent layouts, defrost timings, the control variant, part numbers.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
