Dacor Refrigerator Error Code 99

Error code 99 indicates the refrigerator's control board has detected a shorted thermistor in the fresh food or freezer compartment. A shorted thermistor sends a near-zero resistance signal that the system interprets as an extremely warm temperature. The refrigerator cannot accurately regulate temperature in the affected compartment until the faulty sensor or wiring is repaired. This code requires hands-on diagnosis with a multimeter to pinpoint whether the thermistor or its wiring harness is the source of the short.

The shorted thermistor itself does not create a fire or shock hazard in normal circumstances. However, because the control board believes the compartment is excessively warm, the compressor and fans may run more aggressively than necessary, which can affect food preservation and long-term component wear. Food safety should be monitored closely until the fault is resolved, as the refrigerator's temperature regulation is unreliable while the code is active.

Performing a reset by unplugging the refrigerator or cycling the power may temporarily clear the display, but the code will return as soon as the control board re-reads the shorted thermistor signal. The underlying short circuit in the sensor or wiring must be corrected before the fault will clear permanently. Resetting without repairing the cause offers no lasting benefit and delays addressing the actual problem.

A knowledgeable DIYer comfortable with a multimeter can perform the initial diagnosis by checking the thermistor's resistance after disconnecting its harness connector. If the sensor reads near zero ohms, replacing the thermistor is a straightforward repair involving unplugging the old sensor and connecting the new one. However, if the fault is traced to the wiring harness or control board, the repair becomes more complex and professional service is recommended.

If the thermistor is the failed component, parts and labor typically range from around $100 to $250 depending on the specific model and your location. If the wiring harness requires repair or replacement, costs can rise to the $150 to $350 range. A control board replacement, required only in rare cases, is a significantly more expensive repair that can range from $300 to $600 or more including labor.