Bosch Cooktop Error Code ER 23

ER 23 means the cooktop has detected that its PWM frequency, the signal used to control power delivery to the induction heating elements, is operating outside of its acceptable range. The cooktop shuts down the affected zone automatically as a safety measure. This fault points to an issue within the inverter or power control board electronics. A technician should inspect these components to diagnose the root cause.

No, you should not attempt to use the cooktop while this error is active. The cooktop has shut down the affected zone because it detected a condition outside safe operating parameters. Continued operation could risk further damage to internal electronics or create a safety hazard. Discontinue use until the fault has been diagnosed and repaired.

Repair costs depend on which component has failed. If the issue is a power or inverter board replacement, parts and labor typically range from $200 to $500 or more depending on the specific model and local labor rates. If the induction coil assembly requires replacement, costs can be similar or higher. Getting a diagnostic estimate from a certified technician before authorizing repairs is recommended.

Some basic checks are possible at home, such as confirming the cooktop's ventilation is clear and that all accessible wiring connectors are secure. However, the fault involves the high-voltage inverter circuitry, which carries dangerous voltage levels even when the unit is unplugged due to capacitor charge storage. Component-level diagnosis and board replacement should be performed by a qualified appliance technician.

Powering the cooktop off at the breaker for several minutes and restarting may temporarily clear the display if the error was triggered by a transient overheating event. However, if the underlying cause is a failing power board, damaged coil, or degraded capacitors, the error will return during use. A reset does not fix the hardware fault and should only be used as an initial diagnostic step.