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Error code reference

Bosch Refrigerator Error Code r1

R-sensor (refrigerator sensor) disconnection or short circuit.

Bosch codesBosch refrigerator codes

R-sensor (refrigerator sensor) disconnection or short circuit.

First step from the service manual

Measure the resistance between both terminals after separating CN7 (or CN14) of the Main PCB. If disconnected or shorted, change the R-sensor in the refrigerator compartment.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What r1 means on a Bosch refrigerator

The r1 error code on a Bosch refrigerator indicates a fault with the R-sensor, which is the temperature sensor located inside the refrigerator compartment. This sensor is a thermistor that continuously monitors the internal temperature and sends resistance-based signals to the Main PCB so the control board can regulate the cooling cycle. When the board detects that the signal is outside the expected range, either due to an open circuit from a disconnected sensor or a short circuit causing abnormal resistance readings, it logs the r1 code and may interrupt normal cooling operation.

The primary diagnostic procedure involves isolating the sensor from the Main PCB by unplugging connector CN7 or CN14, depending on the specific model variant. With the connector separated, a technician uses a multimeter to measure resistance across both terminals of the sensor harness. A disconnected sensor will show infinite resistance (open circuit), while a shorted sensor will show near-zero resistance. Either reading confirms sensor failure and requires replacement of the R-sensor in the refrigerator compartment.

Common causes of this fault include physical damage to the sensor itself, wiring harness breaks due to repeated door opening and flexing, connector corrosion from moisture exposure inside the compartment, or sensor degradation over time. In rarer cases, the fault can originate at the Main PCB connector pins rather than the sensor, so inspecting CN7 or CN14 for bent pins or corrosion before condemning the sensor is a worthwhile step in the diagnostic process.

Source: manufacturer service documentation.

Common causes of r1

  1. 01

    Failed or degraded R-sensor thermistor

    Part replacement

    The thermistor element inside the R-sensor can fail over time, producing an open circuit or short circuit reading when measured at connector CN7 or CN14. This is the most common source of the r1 code and requires sensor replacement.

  2. 02

    Disconnected sensor wiring harness

    Wiring / connection

    The wire harness running from the R-sensor to the Main PCB connector can become physically disconnected due to vibration, movement, or improper reassembly after a repair. Inspecting and reseating the connector at CN7 or CN14 may resolve the fault without part replacement.

  3. 03

    Damaged or broken sensor wire

    Part replacement

    Repeated flexing of the harness near door hinges or cable routing points can cause internal wire breaks that result in an open circuit reading. A visual inspection along the full wire run can help identify pinched or frayed sections.

  4. 04

    Corroded or damaged connector pins at CN7 or CN14

    Wiring / connection

    Moisture inside the refrigerator compartment can cause corrosion on the connector pins at CN7 or CN14 on the Main PCB, creating resistance faults that mimic a failed sensor. Inspecting the connector for green or white oxidation and cleaning or replacing the connector can resolve this issue.

  5. 05

    Main PCB connector damage

    Part replacement

    Bent or damaged pins at the CN7 or CN14 socket on the Main PCB can cause intermittent or permanent loss of signal from the R-sensor. If sensor resistance measures correctly when tested at the sensor end but the fault persists, the board connector or the board itself may need attention.

See the test procedure for each cause

Frequently asked questions about r1

What does r1 mean on a Bosch refrigerator?
The r1 code indicates a problem with the R-sensor, the temperature sensor located inside the refrigerator compartment. The Main PCB has detected either an open circuit, meaning the sensor is disconnected, or a short circuit in the sensor circuit. This fault prevents the control board from accurately reading the compartment temperature, which can affect cooling performance.
Can I fix the r1 error myself on a Bosch refrigerator?
A knowledgeable DIYer can perform the basic diagnostic step of checking the connector at CN7 or CN14 for a loose or corroded connection and reseating it. However, accurately diagnosing the fault requires a multimeter to measure sensor resistance, and replacing the R-sensor involves accessing internal compartment components. If you are not comfortable with electrical testing or disassembly, a qualified technician is recommended.
Is it safe to keep using my Bosch refrigerator when the r1 code is showing?
Continued use is not recommended. The r1 fault means the control board cannot reliably monitor the refrigerator compartment temperature, which may cause inconsistent cooling or a complete loss of cooling. Food safety can be compromised if the compartment temperature rises above safe levels without the board detecting it.
How much does it cost to repair the r1 error on a Bosch refrigerator?
If only the R-sensor needs replacement, parts typically range from around $20 to $60 depending on the model, with labor costs adding $80 to $150 or more if a technician performs the repair. If the Main PCB is involved, repair costs can be significantly higher, ranging from $200 to $400 or more for parts and labor combined.
Will resetting my Bosch refrigerator clear the r1 error code?
A power reset may temporarily clear the r1 code from the display, but the code will return if the underlying sensor fault is still present. The Main PCB will re-detect the open circuit or short circuit condition during normal operation and log the fault again. A permanent fix requires diagnosing and resolving the sensor or wiring issue at CN7 or CN14.

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