Bosch Cooktop Error Codes

11 error codes for Bosch cooktop models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

ER 12Mismatch of relay port pin and software register.ER 13Invalid EEPROM data detected.ER 22Keyboard error detected by the mTwist control system.ER 23PWM frequency out of limit.ER 24Wrong number of relays detected.ER 25False connection of mains supply detected.ER 26Relay supply voltage too high in the off state of control.ER 35Selection of keys error detected by the mTwist control system.F2User Interface overheating error F4User Interface overheating error F5User Interface overheating warning

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M+ Max·Bosch Cooktop

ER 12 on my Bosch Cooktop

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Mismatch of relay port pin and software register

From Service Manual 585428, p.40:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part 00705047

Control module

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