Bosch Range Error Code E118

E118 on a Bosch range means the control system has detected that the cooling fan speed is too low. The cooling fan protects the electronic control components from heat during operation. When the fan's rotational speed falls below the expected level, the range logs this fault to prevent heat damage to the electronics. You will need to inspect the fan, its wiring, and potentially run the Fan Test in service mode to pinpoint the cause.

It is not advisable to continue using the range while E118 is active. The cooling fan exists specifically to protect the electronic control components from overheating. Operating the range without proper fan function risks permanent heat damage to the control module, which can lead to more extensive and expensive repairs. Discontinue use until the fault is diagnosed and corrected.

Repair costs for E118 vary depending on the root cause. If the fix involves clearing a fan obstruction or reseating a connector, costs are minimal, primarily covering a service call in the range of $75 to $150. Replacing the cooling fan motor typically adds $50 to $150 in parts. If the control module requires replacement, total repair costs including parts and labor can range from $300 to $600 or more depending on the specific model.

Some causes of E118 are accessible to a knowledgeable DIYer. Checking for a physically blocked or jammed fan blade and inspecting wiring connectors for loose or damaged terminals can be done without special tools after unplugging the appliance. However, testing the fan motor, interpreting the Fan Test in service mode, and replacing the control module are tasks better suited to a qualified technician with experience on Bosch appliances.

A simple power reset may temporarily clear the E118 error, but the code will return if the underlying problem has not been fixed. Because the control board continuously monitors fan speed during operation, any condition that causes the fan to run too slowly will trigger the fault again. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for proper diagnosis and repair.