The short answer for this family
Alpicool's QX family answers a cabinet that will not hold temperature in a particular order, and a defrost cycle that has stopped running is at the top of it. The order below is this family's own, and it is not the order the brand-generic article sets out. The first checks below need no tools and no panel off, and they remove most of this list between them.
What the owner sees
- Frost builds as a sheet on the back wall — A sheet rather than the usual light dusting is an airflow story.
- The display looks normal and nothing runs — Power present and no compressor is a different problem from a compressor that runs and fails.
- The back of the unit is hot to the hand — Heat that cannot leave the coil is heat that comes back inside.
- One compartment holds and the other does not — Cold being made but not moved looks exactly like this.
- More than one QX unit shows the same thing — With 3 builds under this key, the same behaviour across two of them points at the family rather than at one machine.
- NEAR MISS — only the ice has stopped — Ice can stop for reasons that have nothing to do with cabinet temperature; that is the ice page.
Causes, most likely first on the QX family
- A defrost cycle that has stopped running — It is where this family starts. The unit works normally for a while after a manual thaw, which is the clearest evidence of this cause.
- A frosted evaporator blocking the air path — Second on this family. It is the cause most often mistaken for a dead compressor, because both leave a cabinet warm and a machine running.
- A failed evaporator fan motor — Third. Cold is made and then not delivered, so one compartment holds while the other drifts.
- A sealed-system leak or a failed compressor — Ranked last. It is the least likely cause on this list and the only one that cannot be checked from outside.
- Body: The brand-generic article on this symptom opens on a frosted evaporator blocking the air path. Here it does not: a defrost cycle that has stopped running has moved above it, and a frosted evaporator blocking the air path has moved down the list. What moved it is the spread of the entries this family's model table carries.
Check in this order, and why
- Note whether the frost returns on a schedule after a manual thaw — A cycle that has stopped running leaves a little more ice behind each time.
- Empty the unit, leave it open for a day and watch it recover — A unit that comes back after a thaw has named its own cause.
- Listen for the evaporator fan with the door switch held closed — No fan with a clean evaporator separates the two likeliest causes before a tool comes out.
- Look for oil traces at the compressor — Oil outside the tubing means the system is open and the checks above no longer apply.
- Body: The QX members share a layout, so this order holds across the ladder; what changes with size is how long each check takes, not which check comes first.
Before any panel comes off
Safety
Before a panel comes off, isolate the unit at the plug or at the breaker. A capacitor can hold a charge after the power is off. Do not tape or bridge the door switch to keep a fan running while you look. An interlock that is defeated is a blade that turns while a hand is in the cabinet. Refrigerant work is licensed work: nothing on the sealed side of this machine is owner work, whatever the symptom looks like from the front.
Models in the QX family
Reference| Model number | Family key |
|---|---|
| QX20 | alpicool:refrigerator:qx |
| QX30 | alpicool:refrigerator:qx |
| QX40 | alpicool:refrigerator:qx |
When to call a technician
On this family the split is simple: anything reachable without removing a panel is owner work, and nothing past that is. Work down the checks above first; they cost minutes and they remove most of this list. Call once they have all come back clean, because what is left is a sealed-system leak or a failed compressor, and that is the one cause here with no owner-side check at all. Call straight away, without working down the list, if you smell burning or see oil outside the tubing at the back: oil outside the tubing means the system is open, and every hour it runs after that costs more to put right.
Nearest pages of this class
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
