The short answer for these models
The useful first question is not what has broken but where the cold is going. On a running unit it is being made and then lost, and the three places it is lost are the evaporator, the door and the condenser. Work through those before anyone mentions the compressor. The CCUN models take the same faults in a different order: a single-door cabinet shares one cold source between the chill box and the food space, so a fault in one shows up in the other and the symptom you notice is rarely where the fault is, and the compartment-by-compartment checks therefore come before anything else.
How this shows up
- Which form your CCUN unit is — settle this first — Count the outer doors. One door means one cold source shared between the compartments, so a symptom in either can have its cause in the other.
- The cabinet is warm but you can hear it running — You can hear it working from the next room and the shelves are at room temperature, which is the exact combination this page is about.
- The compressor runs and never cycles off — Continuous running with no pause between cycles means the control is still calling for cold it is not getting.
Causes, most likely first on this family
- The thermostat, the sensor or the control — Placed below the mechanical causes because a control fault is uncommon and because the checks above will have implicated it by elimination if it is the answer. This is where the order departs from the brand-level page: on the CCUN models the construction settles it, so the compartment-by-compartment checks come before the checks that lead anywhere else.
- The sealed system or the compressor — It comes last because every cheap cause above has to be excluded before anyone opens a refrigerant circuit, which is licensed work.
What to check first, and why that order
- First — shut the door on a strip of paper and pull — Do it at several points around the frame. Anywhere the paper slides out without resistance is a leak, and it takes a minute to find. On these models this is the step the construction changes: read the result against the form you identified first, because the same finding means different things on the two.
- Second — set the control to its coldest and listen for the change — Give it a few hours after the change. A response means the control is alive; silence points at it.
Before you open anything
Safety
Switch off at the breaker or pull the plug before any panel comes off — a capacitor can hold a charge after the power is off. Nothing on the sealed refrigeration side is an owner job: leave the pipework, the compressor and anything carrying refrigerant to a licensed technician. Move food to a cool box rather than opening the door repeatedly to check on it.
Where the owner job ends
Book the visit when the door seals, the vents, the condenser and the setting have all been checked and the cabinet still will not hold. Book it the same day if food is at risk, and say how long the unit runs between stops — a cabinet that never stops is a different fault from one that cycles normally and still runs warm.
The other symptoms covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
