Samsung Refrigerator Error Code Comp over voltage

The Comp over voltage error means the inverter control board detected that the input voltage to the compressor circuit exceeded AC 155V. When this threshold is crossed, the board shuts down the compressor to prevent damage. The fault can result from a true over-voltage condition at the electrical supply or from failed sensing resistors (R501, R505, R509) on the inverter board that are reporting an inaccurate voltage reading.

When the Comp over voltage error is active, the compressor is already shut down by the control board, so the refrigerator will not be cooling. Continuing to operate the unit without resolving the root cause risks damage to the compressor or inverter board if the over-voltage condition is real. It is best to address the fault promptly, especially since food safety is a concern once cooling is interrupted.

Repair costs depend on the root cause. If only the sensing resistors need replacement, parts cost is relatively low, typically in the range of a few dollars for components, though labor from a technician will add to that. If the full inverter control board requires replacement, parts alone can range from roughly $100 to $250 or more depending on the model, plus labor. If the issue is a home wiring or electrical supply problem, an electrician's service call would be a separate expense.

Some steps are DIY-friendly, such as measuring the outlet voltage with a multimeter to rule out a supply issue or checking whether the refrigerator is on a shared circuit. However, diagnosing and replacing the sensing resistors R501, R505, and R509 on the inverter board requires comfort with electronics work and proper safety precautions. Replacing the inverter board, if that is the root cause, is a more involved repair that many technicians recommend leaving to a professional.

A power reset, such as unplugging the unit for a few minutes, may temporarily clear the error if it was triggered by a single transient power surge. However, if the underlying cause is a failed sensing resistor or a persistent over-voltage condition at the electrical supply, the error will return after the reset. A reset should be used as a diagnostic step, not a permanent fix.