Bosch Refrigerator Error Code rt

The rt code indicates a problem with the Room Temperature sensor (RT-sensor), which monitors the ambient temperature around the refrigerator. The Main PCB has detected that the sensor signal is either at 0V (short circuit) or at 5V (disconnected/open circuit), both of which fall outside the normal 0.5V to 4.5V operating range. The fault can originate in the sensor itself, the wiring harness, or the connector between the two.

The rt error relates to the ambient room temperature sensor rather than the internal food compartment sensors, so the refrigerator may continue cooling to some degree. However, the unit cannot fully optimize its operation without this input, and performance may be affected. It is best to have the fault diagnosed and repaired promptly rather than continuing to run the appliance with an active sensor fault.

A power reset may temporarily clear the rt code from the display, but the error will return if the underlying sensor fault has not been corrected. Because the code is triggered by a specific electrical condition (0V or 5V at the sensor input), the refrigerator will detect the fault again as soon as it runs its diagnostics. A proper repair, addressing the sensor, wiring, or connector, is required to permanently resolve the error.

Some causes of the rt code, such as a loose or disconnected sensor connector, can be addressed without specialized tools by reseating the connector at the Main PCB. However, properly diagnosing the fault requires measuring voltage at the 'A' test point on the Main PCB with a multimeter. If the sensor itself has failed, replacing it requires comfort working around refrigerator electronics, and mishandling the PCB can cause additional damage.

Repair costs depend on whether the issue is a simple connector problem or requires a new RT-sensor. Parts costs for a replacement sensor typically fall in the range of $20 to $80, while professional labor for diagnosis and repair can add $100 to $250 or more depending on your location and the service provider. If the Main PCB itself is found to be at fault, costs will be significantly higher.