Bosch Refrigerator Error Code rD

The rD code means the refrigerator compartment defrost sensor (RD-sensor) has been detected as disconnected or shorted by the Main PCB. This sensor sits on the evaporator and tracks temperature during defrost cycles. The error indicates the control board is not receiving a valid signal from that sensor circuit.

Operating the refrigerator with an active rD code means the control system cannot properly monitor the defrost cycle, which can lead to ice buildup on the evaporator or inadequate defrost performance over time. Food safety could be compromised if cooling is affected as a result. It is best to address the fault promptly rather than continuing to run the appliance in a faulted state.

If only the RD-sensor needs replacement, parts typically range from around $20 to $60 depending on the specific Bosch model, with professional labor adding $80 to $150 or more depending on your region. If the fault turns out to be a damaged wiring harness, costs may be lower if the harness can be repaired rather than replaced. A Main PCB replacement, if required, would be the most expensive outcome, with parts alone ranging from $150 to $400 or higher.

A knowledgeable DIYer can start by checking that connector CN15 at the Main PCB is firmly seated and that the wiring harness running to the evaporator is not visibly damaged. If you have a multimeter, you can separate CN15 and measure resistance across the sensor terminals to determine if the sensor is open or shorted. Replacing the RD-sensor on the evaporator is a more involved repair that requires accessing the evaporator coil, so comfort with appliance disassembly is needed.

A power reset may temporarily clear the displayed code, but the error will return if the underlying fault with the RD-sensor circuit has not been corrected. The Main PCB monitors the sensor continuously, so any persistent open or short condition will trigger the code again during normal operation. The sensor or wiring issue must be diagnosed and repaired for the code to clear permanently.