Error Code E123

Error Code E123: Oven Temperature Problem

If the E123 error code is displayed on your Bosch, Siemens, Neff, Constructa, or Gaggenau oven, steam oven, or combination appliance, it signals a critical temperature monitoring issue within the unit. This error prevents the appliance from regulating heat accurately and usually requires professional intervention.

This code is triggered when the appliance’s control board detects an anomaly in the internal temperature sensing system. Specifically, the system has logged one of the following conditions:

• Spit Temperature Too Low: The measured temperature associated with the rotisserie (spit) function, often involving a specialized temperature probe or sensor designed for this accessory, is significantly below the minimum threshold required for safe or accurate operation. This indicates a failure in the heating circuit or the dedicated sensor for this function.
• Defective Upper Temperature Sensor: The primary temperature sensor located in the upper section of the oven cavity has failed, is reporting erratic values, or is providing an electrical signal that is out of specification. This sensor is crucial for accurate temperature maintenance, ensuring that the oven reaches and holds the programmed set temperature during standard cooking cycles. A defective sensor prevents the control board from operating reliably.

Recommended Action

Since the error points directly to internal electronic components, faulty wiring, or core temperature regulation hardware, specialized diagnostics and parts replacement are necessary.

• Do Not Use the Appliance: If this code appears, stop using the oven immediately.
• Contact Authorized Service: Due to the complexity and location of the affected parts (sensors, internal wiring harnesses, and control board logic), troubleshooting and replacement must be performed exclusively by a certified technician authorized by the manufacturer (Bosch, Siemens, Neff, etc.).
• Provide Appliance Details: When contacting service, have the specific error code (E123) and the full model number (E-Nr.) of your appliance ready. This will help the technician prepare for the required repair.

Critical Safety Warning

Do not attempt to repair the oven yourself. Opening the appliance and attempting unauthorized internal repair, especially involving safety sensors and high-voltage components, poses a significant risk of electrical shock, further damage to the appliance, and potential fire hazard. This error requires specialized tools and technical expertise to ensure the correct and safe restoration of the appliance’s temperature regulation system.