Thermador Refrigerator Error Code 5-4-1

Error code 5-4-1 on a Thermador refrigerator signals an internal ice maker fault. The code indicates that the ice maker has detected a failure within its own system or in the water inlet heater at the back of the appliance. Ice production will be halted until the underlying cause is diagnosed and corrected.

The refrigerator's main cooling functions are separate from the ice maker, so food stored in the fresh food and freezer compartments should remain safe. However, the ice maker will not produce ice while the fault is active. It is advisable to have the issue diagnosed promptly to avoid any secondary problems related to a malfunctioning water inlet heater.

Repair costs vary depending on which component has failed. Replacing a water inlet heater is generally a lower-cost repair, while a full ice maker assembly replacement will carry a higher parts and labor cost. For a Thermador refrigerator, total repair costs including parts and labor typically range from around $150 to $500 or more, depending on the specific parts required and local labor rates.

A power cycle is the recommended first diagnostic step and may clear the code if the fault was caused by a temporary electrical glitch. Switch the appliance off, wait a few minutes, and turn it back on. If the 5-4-1 code reappears after the reset, a physical component such as the water inlet heater or the ice maker assembly requires inspection and likely replacement.

Start by turning the appliance off and back on to rule out a transient fault. If the code returns, the water inlet heater at the rear of the unit should be tested for proper function. If the heater is working correctly, the ice maker assembly itself is faulty and will need to be replaced. These diagnostics are best performed by a qualified appliance technician.