Thermador Refrigerator Error Code 4 Flashes

The 4 Flashes code means the inverter board has detected a compressor failure. The inverter board monitors the compressor's electrical characteristics and shuts the system down when it senses an abnormal condition. This fault protects the compressor and control electronics from further damage. A technician will need to inspect the wiring and test compressor winding resistance, which should measure approximately 6 to 7 ohms on a healthy unit.

No, the refrigerator is not safe to rely on for food storage when this code is active. The 4 Flashes fault means the compressor has stopped running, so the unit is no longer maintaining proper cooling temperatures. Food spoilage is a concern, and you should transfer perishables to another refrigerator or cooler until the fault is resolved.

Repair costs vary significantly depending on the failed component. An inverter board replacement typically ranges from a few hundred dollars to over five hundred dollars including parts and labor. A compressor replacement is more expensive, often ranging from six hundred to over a thousand dollars depending on labor rates and part availability. Getting a diagnostic assessment from a certified technician first is the best way to understand the full scope of the repair before committing to costs.

The initial diagnostic steps, such as inspecting wiring connections and checking for obvious damage, are within reach for a knowledgeable DIYer with a multimeter. Testing compressor winding resistance requires basic electrical skills but is straightforward. However, replacing a compressor or inverter board involves working with refrigerant systems and high-voltage components, which should be handled by a certified appliance technician.

A power reset may temporarily clear the fault and allow the refrigerator to attempt to restart, but the code will return if the underlying problem is not fixed. Resetting does not repair failed compressor windings or a faulty inverter board. Repeated resets without addressing the root cause can potentially cause additional damage to the inverter board or compressor.