Thermador Cooktop Error Code FOP

The FOP code means the cooktop detected a communication failure between the right and left ELIN modules when the superbooster function was activated. The superbooster feature requires both induction control modules to coordinate in real time, and the cooktop shuts down that feature when it cannot establish the necessary link. The fault points to either wiring connection problems or a failed component in the communication path.

The FOP fault specifically disables the superbooster function, so the cooktop may still operate normally on individual induction zones that do not use that feature. However, continued use without diagnosing the fault is not recommended, as an underlying wiring issue could worsen over time. Have a qualified technician inspect the cooktop before relying on it for regular use.

Repair costs vary depending on which component has failed. If the issue is only a loose or damaged connector, the fix may involve minimal cost beyond a service call fee, which typically ranges from $75 to $150. Relay board replacement parts can range from $100 to $300, while individual ELIN modules are more expensive, often ranging from $200 to $600 or more per unit. Labor charges will add to these part costs depending on your location and service provider.

Disconnecting the cooktop from power and reconnecting it may temporarily clear the FOP code, but the error will return when the superbooster function is activated again if the underlying cause has not been addressed. A reset is a useful first step to confirm the fault is consistent, but it is not a fix. The wiring connections and components must be inspected and repaired to resolve the issue permanently.

Start by disconnecting the cooktop from power and inspecting the wiring connections between the two ELIN modules, specifically the CNT7 to CNT6 connector path, as well as the relay board connection. Reseat any loose connectors and look for damaged or corroded pins. If the connections are secure and the fault returns, the recommended repair sequence is to replace the relay board first, then the right ELIN module, then the left ELIN module.