Thermador Refrigerator Error Code 5-1-1

Error code 5-1-1 on a Thermador refrigerator means the icemaker has detected that the main supply voltage is too high. The icemaker's control system monitors incoming voltage and shuts down ice production when voltage exceeds the acceptable range. This protects the icemaker's motor, water inlet valve, and electronic components from overvoltage damage. The first step is to measure the actual supply voltage at the outlet using a multimeter.

A genuine overvoltage condition feeding your refrigerator can pose risks to the appliance's electronics and, in severe cases, could contribute to overheating of components. Until the root cause is confirmed, it is advisable to keep the icemaker disabled. If supply voltage at the outlet is confirmed to be significantly elevated, avoid using the refrigerator until the electrical issue is corrected by a qualified electrician.

Repair costs vary depending on the root cause. If the issue is limited to an electrician correcting high household voltage, costs can range from around $75 to $200 or more for a service call. If the icemaker control board requires replacement, parts and labor combined typically range from $150 to $400 or higher depending on parts availability and local labor rates. A main refrigerator control board replacement would generally cost more, often in the $300 to $600 range including labor.

Start by measuring the voltage at the wall outlet supplying the refrigerator to determine if the household supply voltage is genuinely elevated. If the voltage is normal, the problem likely lies with the icemaker control board or internal wiring, which may need inspection or replacement. If the supply voltage is high, contact your utility provider or an electrician to address the issue before running the appliance. Do not continue to operate the icemaker under confirmed overvoltage conditions, as this can damage components.

Resetting the refrigerator by unplugging it for several minutes may temporarily clear the 5-1-1 fault code, but the error will return if the underlying voltage issue has not been resolved. A reset is only useful as a diagnostic step after the root cause has been identified and corrected. If the code reappears shortly after a reset, the overvoltage condition or the faulty sensing component is still present and requires further diagnosis.