Thermador Range Error Code F73

F73 on the Thermador Gaggenau Steam Oven ED-220/221 means the main water inlet valve is not closing properly. The control system detected that water flow was not shutting off as expected during or after a steam cycle. This is a safety-related fault that requires prompt diagnosis to prevent water overflow or excessive steam inside the oven cavity.

No, it is not advisable to continue using the steam oven while F73 is active. A water valve that is not closing correctly can allow uncontrolled water flow into the steam generator or oven cavity, which creates a risk of flooding, water damage to internal components, or excessive steam. The appliance should be shut off and the water supply turned off until the fault is resolved.

Repair costs vary depending on the faulty component. Replacing a water inlet valve typically falls in the range of $150 to $350 including parts and labor. If the relay board is the cause, parts and labor can range from $250 to $600 or more depending on part availability and local labor rates. Confirming the exact failed component before ordering parts will help avoid unnecessary expense.

Some basic checks are within reach of a knowledgeable homeowner, such as verifying that the incoming water supply pressure meets the 16 PSI minimum requirement using an inexpensive pressure gauge. However, replacing the water valve or relay board involves working with both water connections and electrical components, so most homeowners will want to call a qualified appliance technician for those steps.

A power reset may temporarily clear the F73 code from the display, but if the underlying cause is a mechanically faulty valve or a failed relay board, the error will return as soon as the oven attempts another steam cycle. Resetting without repairing the root cause does not resolve the problem and may allow the fault condition to persist or worsen.