Thermador Range Error Code 04

Error code 04 indicates an overheating condition in the appliance's heating circuit. The control system has detected that the heater is operating outside of its expected parameters, either running too hot or staying energized when it should be off. This fault is designed to protect the appliance from heat-related damage. A technician should check voltage at the heater and inspect the control module.

Yes, an overheating fault is a safety-related condition. If the heater is being supplied with voltage when it should be off, it can cause the appliance to overheat without any user command. You should stop using the appliance until the fault has been diagnosed and resolved to avoid the risk of damage or fire.

Resetting the appliance by cutting power may temporarily clear the fault display, but it will not fix the underlying problem. If the control module or heater circuit is faulty, the error code 04 will return once the appliance is powered on and the fault condition is detected again. A proper diagnosis of the heater voltage and control module is needed to resolve the issue permanently.

The first step, checking for voltage at the heater, requires electrical testing equipment and knowledge of safe practices around live circuits. If voltage is confirmed to be present when the heater should be off, the control module will need to be replaced, which typically requires disassembly and familiarity with appliance wiring. This repair is best handled by a qualified technician unless you have hands-on experience with appliance electrical systems.

Repair costs depend on the root cause. If the control module is at fault, parts alone can range from roughly $150 to $400 or more depending on the model, with labor adding additional cost. If the issue is a wiring short or a failed temperature sensor, the total repair cost would generally be lower. Getting a diagnostic estimate from a technician before authorizing any parts replacement is advisable.