Sub-Zero · Refrigerator error code
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Guide · RefrigeratorStart by knowing the architecture. Sub-Zero built-ins have two separate sealed systems, so a warm section means a fault in that section's own fan, defrost, sensor or system. Monogram built-ins share one freezer evaporator and feed fresh food through a damper, so a warm fresh-food side with a cold freezer points at the damper, airflow or an iced return passage.
Component test · RefrigeratorThe bi-metal (defrost termination thermostat) is wired in series with the defrost heater. It is closed only when the evaporator is cold and opens once the coil warms during defrost. Testing it at room temperature gives a false "bad" result: it must be cold.
Guide · RefrigeratorSwings usually come from a frosted evaporator (defrost failing), a sticking damper, or a sensor problem. Check frost first, then damper and thermistor.
Sub-Zero · Refrigerator
15 1 01 / 15 2 01
Compressor relay reported stuck closed
Sub-Zero · Refrigerator
EE
Compartment thermistor fault
Sub-Zero · Refrigerator
Service (steady)
Codes logged but not cleared
Sub-Zero · Refrigerator
Vacuum Condenser
Excessive compressor run time