Long run times are normal on variable-speed Sub-Zero models. If the unit runs constantly and temperatures are rising, the usual causes are a dirty condenser or failed condenser fan, a gasket leak, a hot installation space, a defrost problem or a refrigerant leak.
Modern Sub-Zero units with variable-speed compressors are designed to run long, quiet, low-speed cycles. Continuous running is only a problem if temperatures are also off or the unit sounds strained.
Check These First (5 Minutes, No Tools)
- Check compartment temperatures with a thermometer. If they're correct, long run time is likely normal.
- Clean the condenser.
- Check gaskets and door closing.
- Consider the room: units near ovens, in direct sun or in hot garages run longer.
Most Common Causes
| Cause | What happens | Fix |
|---|---|---|
| Dirty condenser | Reduced capacity, longer cycles. | DIY |
| Condenser fan | Poor heat rejection. | Pro |
| Gasket leak | Constant heat load. | DIY / Pro |
| Defrost failure | Iced coil reduces capacity. | Pro |
| Low refrigerant (leak) | System can't reach set point. | Pro |
How We Fix It
We measure temperatures and compressor amperage, check airflow and seals, and evaluate the sealed system only if everything else checks out.
When to Call a Technician
If the basic checks above don't solve it within a few hours, or if you hear repeated clicking, see an alarm or service indicator, or notice water under cabinetry, call us at (725) 237-7399. The $75 service call is credited toward your repair, repairs carry a 1-year parts and 180-day labor warranty, and we stock the Sub-Zero parts behind most of these failures.
Typical Cost
| Repair | Typical range |
|---|---|
| Condenser cleaning & performance tune-up | $189 – $289 |
| Condenser fan motor replacement | $345 – $625 |
| Door or drawer gasket replacement | $295 – $595 |
| Refrigerant leak repair, evacuation & recharge | $995 – $2,150 |
Typical totals for parts and labor in the Las Vegas area. The $75 service call is credited toward your repair, and every repair is backed by a 1-year parts and 180-day labor warranty. Your exact price depends on the model, the part and access, and you approve a firm quote before any work begins. Full price list →
Still Not Working? We Can Help Today.
$75 service call, credited toward your repair · 1-year parts · 180-day labor warranty · EPA 608 certified · Mon–Fri 8am–7pm · Sat–Sun 8am–4pm