Sub-Zero Refrigerator Error Code 15 2 00

Error code 15 2 00 means the Zone 2 compressor relay is detected as stuck open, with no current flowing through that compressor circuit. The refrigerator's control system cannot confirm that the compressor is receiving power or running. This points to a problem with the relay itself, the inverter board, the wiring harness, or the control board.

The Zone 2 compressor will not run properly while this fault is active, which means one section of the refrigerator may not maintain its set temperature. Food safety becomes a concern if temperatures rise into the unsafe range. It is best to address this code promptly and monitor temperatures closely until the repair is completed.

A reset may temporarily clear the code from the display, but if the underlying fault in the relay, inverter, wiring, or control board is still present, the code will return once the system runs its diagnostics again. A reset alone does not repair any of the components involved, so professional diagnosis is still required to resolve the issue permanently.

Some basic checks, such as inspecting wiring connections and connectors for looseness or corrosion, can be performed by a knowledgeable DIYer. However, diagnosing and replacing the inverter board, compressor relay, or control board requires familiarity with refrigeration electronics and should be handled by a qualified technician. Working on these components involves line voltage and should only be attempted with the unit unplugged during physical inspections.

Repair costs vary depending on the failed component. A wiring repair or relay replacement is generally less expensive, typically in the range of $150 to $400 including labor. An inverter board replacement can range from $400 to $900 or more depending on parts and labor rates. Control board replacement tends to be at the higher end of the cost spectrum for this fault.