The short answer
Every model in the ATMM roster shares one capacity core and differs only in finish or trim, so the cabinet behind them is the same machine throughout, and its entries differ only in the trailing finish position. When one compartment is cold and the other is not, the cabinet has an airflow problem rather than a cooling problem, because on cabinets of this kind the cold is made in one place and moved to the other. That single observation redirects the whole diagnosis.
What you observe on these models
- The compressor never cycles off — The cabinet is no longer reaching its set point, so the control never tells it to stop. This is the clearest sign that a restriction is at work.
- Food is spoiling faster than it should even though the cabinet feels cool — Cool is not cold. A cabinet can feel acceptable to the hand and still sit above the safe storage threshold all day.
- Condensation or ice along the door seal — Warm humid room air arriving where the seal is not closing. The frost marks the leak, which makes it the most self-diagnosing symptom on this list.
- It recovers after being emptied and drifts again once refilled — A cabinet short of capacity rather than broken, which points at airflow, seal or condenser rather than at the compressor.
Causes, most likely first on the ATMM line
- Frosted evaporator blocking the air path — Ranked first on this roster: frost builds quietly over weeks, which is why owners notice the temperature rather than the ice that caused it.
- Door seal not closing, or a door left ajar — Ranked second on this roster: a seal that has taken a set admits room air continuously, and a cabinet cannot out-run a steady supply of warm humid air no matter how well the rest of it is working.
- Vents blocked by stored food or an overfilled shelf — It ranks third here because it is free to correct, extremely common after a big shop, and produces exactly the one-compartment-warm pattern owners describe.
- Start components or the sealed system — Ranked last on this roster: reaching it honestly is a useful result, because it turns the question into repair or replace rather than keep looking.
- Body: Where this ranking departs from the brand-generic order is door seal not closing, which moves up on the ATMM line because this roster is two or three closely related cabinets, so the order follows how those particular machines are built rather than an average across the brand.
Check in this order, and why
- Look at the rear interior wall for a frost sheet — A layer thick enough to hide the surface underneath explains the complaint on its own, and it means the defrost side is worth investigating.
- Close the door on a strip of paper at several points and pull — Anywhere the paper slides out freely is admitting air. Check the whole perimeter, not just the handle side.
- Clear the back of every shelf and find the vents — Leave a hand's width clear at the rear of each shelf, then give the cabinet a day before judging.
- Have the circuit assessed rather than guessed at — This needs gauges and a licence. Oil on the tubing at the back means the circuit is already open and it should stop running.
Before you open anything
Safety
Unplug the cabinet or switch off its breaker before removing any panel; a capacitor can hold a charge after the power is off. Never chip frost off the rear interior wall with a sharp tool, because the tubing behind it is thin-walled and a nicked tube turns a defrost into a replacement. A refrigerator holds food safely at 40 °F (4 °C) or below, so move anything perishable to a cooler before you start rather than after.
Models in the ATMM family
Reference| Model number | Family key |
|---|---|
| ATMM071ADB | arctic-king:refrigerator:atmm |
| ATMM071ADS | arctic-king:refrigerator:atmm |
| ATMM071ADW | arctic-king:refrigerator:atmm |
When to call a technician
Call when a full defrost, a cleared condenser and a clean paper test have all failed to hold the cabinet for a day, because that pattern eliminates everything an owner can reach. Call sooner if only one compartment is affected and the vents are already clear, because a damper or an interior fan needs a panel off. Either way, move the perishable load first: it will not survive the diagnosis.
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.
