A Kenmore refrigerator that never cycles off is telling you it cannot reach its target temperature — the compressor keeps running because the cooling load never drops. Before assuming a fault, know that a normal Kenmore runs a duty cycle of roughly 40 to 80% depending on ambient heat, door openings, and load, and it will run near-continuously for a while after you stock it with warm groceries. Constant running becomes a problem when it persists and the temperature drifts. Which parts to check depends on your platform: 106-series units are built on the Whirlpool design, 795-series Elite units on the LG design.
Quick Answer#
Quick answer: Most likely a failed defrost system has iced over the evaporator coil, choking airflow so the compressor runs constantly to compensate — this is the most common and most-missed cause on both platforms. Dirty condenser coils and a worn door gasket are the next suspects; a sealed-system refrigerant leak is the least common.
Do You Have the Right Tools?
Refrigerant gauges ($200+), vacuum pump ($250), leak detector ($150), and EPA-certified recovery equipment. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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106-series (Whirlpool platform), ranked#
| Cause | What you'll notice | How likely |
|---|---|---|
| Defrost system failure | Frost on the freezer rear panel, warming fridge | 35% |
| Dirty condenser coils | Warm coils, compressor never rests | 25% |
| Door gasket degradation | Warm air leaking in, sweating around the door | 20% |
| Low refrigerant charge | Slow cooling loss over months | 15% |
| Thermistor reading wrong | Board thinks it is warmer than it is | 5% |
The most common 106-series cause is a failed Adaptive Defrost Control board (part W10366605) or defrost heater: frost builds on the evaporator coil until airflow is blocked, and the compressor runs continuously trying to cool through the ice. Dirty bottom-mounted condenser coils — reached from the front by pulling the kickplate grille — are next, because a coil that cannot shed heat forces endless running. A degraded door gasket lets warm room air seep in so the thermal load never falls, and a slow refrigerant leak at an evaporator braze joint gradually starves cooling capacity. Least common is a thermistor drifting warm, which fools the board into never satisfying.
795-series (LG platform), ranked#
| Cause | What you'll notice | How likely |
|---|---|---|
| Linear compressor degradation | Runs constantly, cooling slowly weakens | 30% |
| Condenser coil fouling | Warm coils, compressor never rests | 25% |
| Defrost system failure | Er dH or Er dS shown, coil icing | 25% |
| Sealed-system micro-leak | Continuous running, temperature creeping up | 20% |
On 795-series Elite models the LG linear compressor can lose pumping efficiency before it fails outright, so the board runs it continuously to make up the shortfall. Coil fouling behaves the same as on the 106-series, though some 795 units place the condenser at the rear rather than the bottom. Defrost failure again ices the evaporator, and these units typically flag it as an Er dH or Er dS code. Sealed-system micro-leaks at factory braze joints are a documented issue on certain runs and produce the same profile: constant running with the temperature slowly climbing.
Safety First — Know the Risks
Refrigerant (R-134a/R-600a) requires EPA certification to handle. Improper discharge is a federal violation and health hazard. Our techs are licensed and insured — let them handle the risk.
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When constant running is actually normal#
Some extended running is expected rather than a fault. A hot kitchen — above 90°F, common in an unconditioned room — keeps the compressor working hard, as does a large load of warm groceries or frequent door openings on a warm day. If the fridge is holding temperature and the running eases once conditions settle, it is doing its job. The concern is constant running paired with a temperature that will not come down.
How to check it yourself#
- Rule out normal causes — ambient heat, a fresh warm load, or heavy door use.
- Feel the freezer rear panel for frost, which points at the defrost system.
- Clean the condenser coils at the kickplate or rear.
- Inspect the door gasket for gaps and warm-air infiltration.
- Note any Er dH / Er dS code on 795-series units.
The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
Licensed & Insured · 90-Day Warranty · Same-Day Service
DIY or call a pro?#
Ruling out normal causes, cleaning coils, and checking the gasket are straightforward owner steps that resolve a good share of constant-running cases. A failed defrost board or heater, a degraded compressor, or a sealed-system leak needs a technician — the last one requires certified refrigerant handling. If the fridge keeps running and the temperature will not hold after cleaning, book a diagnostic and we will identify the platform-specific part before ordering it.
Appliance Repair Technician · 11 years experience
Experienced technician with 11 years specializing in Frigidaire and Electrolux refrigerator and dryer repair with a focus on safety.
