The short answer
When the M family stops cooling while the compressor still runs, the fault is usually that cold air is not moving rather than that cold is not being made. This page ranks the causes for that build; the brand-generic article ranks them for the brand as a whole.
What you observe
- A sheet of frost on the evaporator or the rear wall — A stalled defrost: the ice itself is now blocking the air path.
- Freezer side still cold, fresh-food side warm — Near-diagnostic on a shared-evaporator cabinet, and it points at the air path rather than the system.
- Cooling recovers for a day after the doors are left open — Near-diagnostic for a defrost fault: melting the ice restores the air path temporarily.
- The compartment is colder at the bottom than the top — An air-distribution problem rather than a failure to make cold.
- NEAR MISS - silent and not cold — That is a no-power or start-relay fault and belongs on a different page.
Causes, most likely first on M
- Evaporator or circulation fan not running — Ranked first on the M family: a single small fan does all the work here, so it stops the cooling completely when it fails. The order below follows the air path rather than the refrigeration circuit, which is a family property and not a model one. This moves above blocked airflow from a frosted evaporator, which leads the brand-generic order, because these models share one layout, so its weak point shows across the whole family.
- Blocked airflow from a frosted evaporator — Second: a compact cabinet has a single small evaporator and almost no air reserve, so frost stops the cooling almost at once.
- Door seals, door alignment and loading — Third: the free check, and a genuine finding on any cabinet that has started running without stopping: a seal that no longer meets loads the machine continuously.
- Condenser coil choked or its fan stalled — Fourth: the coil is often a bare rear grid on this class of unit and needs clearance behind it to work at all.
- Sealed-system or compressor fault — Last: last, and the one that decides the fate of the appliance rather than the repair; refrigerant work is licensed work and the diagnosis is not an owner diagnosis.
Check in this order, and why
- Listen at the cabinet for the circulation fan — It separates the two likeliest causes before any panel comes off.
- Compare the two compartments against each other — One cold and one warm is an air path; both warm is the system or the condenser.
- Look behind the rear panel for a frost sheet — A solid sheet rather than a light dusting confirms a defrost fault.
- Test each door seal with a sheet of paper — Last, because it explains a struggling cabinet rather than a warm one.
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. Shut the water supply at the stop tap before touching any fill line, and treat the sealed system as off limits: refrigerant work is licensed work.
When to call a technician
A refrigerator holds food safely at 40 °F (4 °C) or below and a freezer at 0 °F (−18 °C) or below; move perishables once the cabinet is above that. Cleaning a condenser and testing seals are owner work. Call as soon as the sealed system is suspected, because refrigerant work is licensed work.
Other M pages
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