SUB-ZERO DIAGNOSTICS
Freezer Repair
Columns, drawers, and undercounter freezer units — frost management, evaporator icing, and slow refrigerant loss that built-in cabinetry masks longer than a standalone unit.
Request Service — $95 Flat DiagnosticCommon symptoms
- Frost buildup returning shortly after defrost cycle
- Iced-over evaporator coil
- Slow refrigerant loss symptoms (long cycle times, warm spots)
Models we service
Frequently asked questions
Why does frost keep coming back in my Sub-Zero freezer after I clear it?+
Recurring frost usually means the defrost cycle isn't fully completing — often a defrost heater, thermostat, or timer issue rather than the frost itself. Clearing the ice treats the symptom; the defrost system is what needs diagnosing.
What causes a Sub-Zero freezer to run constantly without shutting off?+
Continuous running points to the compressor struggling to reach set temperature — usually from a dirty condenser, blocked airflow, a door not sealing fully, or in some cases a slow refrigerant loss. Condenser cleanliness is checked first.
Is a slow refrigerant leak in a Sub-Zero freezer dangerous, and how is it diagnosed?+
Sub-Zero systems use refrigerants that aren't a household safety hazard in small leaks, but an undiagnosed leak steadily reduces cooling and can damage the compressor over time. Diagnosis involves pressure testing the sealed system to locate and repair the leak point.