Bosch Range Error Code ER23

ER23 means the electric cooktop's MTwisT control system has detected a PWM frequency signal that is outside of its accepted operating range. The MTwisT system is the rotary control interface that converts knob input into power level signals for the cooktop elements. This error points to a fault in the control signal pathway, which could involve the MTwisT module, its wiring, or the main control board.

You should not continue using the cooktop while ER23 is active. The error indicates the control system governing power delivery to the cooking elements is operating outside normal parameters, which means power levels may not be accurately controlled. Discontinue use until the fault is diagnosed and resolved.

Repair costs depend on which component has failed. Wiring harness repairs or connector reseating by a technician may cost in the range of $100 to $200 for labor alone. Replacing the MTwisT control module or the main control board typically adds parts costs that can bring the total to somewhere between $250 and $600 or more, depending on the specific model and local labor rates.

A knowledgeable DIYer can start by inspecting the wiring harness between the MTwisT module and the main control board for loose or damaged connectors and reseating them. However, if the MTwisT module or main control board needs replacement, those repairs require sourcing the correct components and comfort working with appliance electronics. If you are not experienced with appliance repair, a qualified technician is recommended.

A power reset by switching off the circuit breaker for 30 to 60 seconds may temporarily clear the error, but if the underlying component fault remains, the code will return. A reset is useful for confirming whether the error is intermittent or persistent, but it is not a repair for a failed MTwisT module, damaged wiring, or a faulty control board.