Bosch Cooktop Error Code ER 24

ER 24 means the cooktop's control board has detected a wrong number of relays during its internal diagnostic check. Relays are the switching components that control power to each cooking zone, and the board expects a specific count based on the model. When that count is off, the board triggers ER 24 and typically disables heating to prevent unsafe operation. The fault usually points to a failed relay, a faulty control board, or a wiring issue.

No, you should not continue using the cooktop while ER 24 is active. The error indicates that the control board cannot confirm the relay configuration is operating correctly, which means heating zones may behave unpredictably. Continuing to use the appliance in this state could pose a safety risk and may cause additional damage to other components.

Repair costs depend on which component is at fault. A relay board replacement typically runs in the range of $100 to $250 for parts, while a main control board can cost $150 to $400 or more depending on the model. Adding professional labor, total repair costs commonly fall between $200 and $550. Getting a diagnosis from a technician before ordering parts is advisable to avoid purchasing the wrong component.

Some aspects of diagnosis, such as checking for loose connectors or reseating wiring harnesses, can be done by a careful DIYer with experience working on appliances. However, replacing a relay board or main control board involves working near high-voltage components and requires proper safety precautions, including disconnecting power at the breaker before opening the unit. If you are not comfortable with appliance electronics repair, a qualified technician is the safer option.

A power reset, done by switching off the circuit breaker for 30 to 60 seconds and then restoring power, may temporarily clear the error if it was caused by a transient control board glitch. However, if the underlying cause is a physically failed relay or damaged wiring, the error will return after the reset. A permanent fix requires identifying and replacing the faulty component.