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Error code reference

Bosch Refrigerator Error Code iD

IDUCT-sensor disconnection or short circuit.

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IDUCT-sensor disconnection or short circuit.

First step from the service manual

Measure the resistance between both terminals after separating CN15 of the Main PCB. If ID-sensor is disconnected or shorted, change the ID-sensor on the evaporator.

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

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What iD means on a Bosch refrigerator

The iD error code on a Bosch refrigerator indicates a fault with the IDUCT sensor, which monitors temperature within the refrigerator's duct or air distribution channel. This sensor plays a critical role in regulating cold air flow from the evaporator section into the fresh food compartment. When the control system detects that the IDUCT sensor circuit is either open (disconnected) or shorted, it triggers the iD code to alert the technician that reliable temperature data from that location is no longer available.

The primary diagnostic procedure involves isolating connector CN15 on the Main PCB and measuring resistance across both sensor terminals. A properly functioning NTC-type temperature sensor will show a predictable resistance value corresponding to ambient temperature. An open circuit reading (infinite resistance) confirms a broken wire or failed sensor element, while a near-zero resistance reading confirms a short circuit within the sensor or its wiring harness. Either condition requires replacement of the IDUCT sensor located on the evaporator assembly.

Common causes include physical damage to the sensor wiring from ice buildup around the evaporator, connector corrosion at CN15 causing poor contact, or outright sensor element failure due to age or moisture ingress. Because this sensor is positioned near the evaporator, it is frequently exposed to freeze-thaw cycles that can degrade both the sensor body and its lead wires over time. Addressing this fault promptly is important because without accurate duct temperature data, the refrigerator's control logic cannot properly regulate cooling cycles.

Source: manufacturer service documentation.

Common causes of iD

  1. 01

    IDUCT sensor failure

    Part replacement

    The sensor element itself has failed internally, producing either an open or shorted circuit. This is the most common root cause and is confirmed by measuring resistance at CN15 after disconnecting the connector from the Main PCB.

  2. 02

    Damaged sensor wiring

    Part replacement

    The wire leads connecting the IDUCT sensor to CN15 on the Main PCB may be cracked, pinched, or broken, particularly near the evaporator where repeated freeze-thaw cycles stress the insulation. Inspect the full wire run for visible damage or breaks.

  3. 03

    Corroded or loose CN15 connector

    Wiring / connection

    Moisture near the evaporator can cause corrosion at the CN15 connector pins on the Main PCB, creating an intermittent or open circuit without the sensor itself being defective. Cleaning or reseating the connector may resolve the fault if the sensor tests within spec.

  4. 04

    Ice buildup around the sensor

    Part replacement

    Excessive frost accumulation near the evaporator can physically compress or damage the sensor and its wiring. If a defrost system fault has allowed heavy ice buildup, the IDUCT sensor may have been damaged secondarily.

  5. 05

    Main PCB port fault

    Part replacement

    In rare cases the CN15 port on the Main PCB itself is damaged, causing the board to misread a valid sensor as disconnected or shorted. This is diagnosed only after the sensor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about iD

What does iD mean on a Bosch refrigerator?
The iD code indicates that the IDUCT sensor, which monitors temperature in the refrigerator's air duct near the evaporator, has been detected as disconnected or short-circuited by the Main PCB. The control board uses this sensor to regulate cold air distribution into the fresh food compartment. When the sensor circuit fails either open or shorted, the board logs this fault and displays the iD code. The sensor located on the evaporator will need to be tested and likely replaced.
Can I fix the iD error code on my Bosch refrigerator myself?
A knowledgeable DIYer with a multimeter can perform the initial diagnostic by disconnecting connector CN15 from the Main PCB and measuring resistance across the IDUCT sensor terminals. If the reading shows an open or shorted circuit, the sensor on the evaporator needs to be replaced. Accessing the evaporator typically requires removing interior panels, so comfort with appliance disassembly is necessary. If the wiring and sensor both test acceptable, the issue may involve the Main PCB, which is best handled by a qualified technician.
Is it safe to keep using my refrigerator while the iD code is active?
Operating the refrigerator with an active iD fault means the control board is working without valid temperature data from the IDUCT sensor, which can compromise its ability to maintain consistent temperatures in the fresh food section. Food safety may be at risk if cooling cycles are not regulated properly. It is advisable to monitor internal temperatures closely with a thermometer and have the fault repaired promptly rather than relying on the unit long-term in this condition.
How much does it cost to repair the iD error on a Bosch refrigerator?
If only the IDUCT sensor needs replacement, parts costs typically fall in the range of $20 to $80 depending on the specific model, with labor adding $75 to $200 depending on your location and service provider. If the Main PCB is determined to be faulty, costs can rise significantly, generally ranging from $200 to $500 or more for the board plus labor. Getting a diagnostic assessment from a technician before committing to repairs is the best approach.
Will resetting my Bosch refrigerator clear the iD error code?
Performing a power reset by unplugging the refrigerator for several minutes may temporarily clear the displayed code, but the iD fault will return if the underlying IDUCT sensor issue has not been corrected. The control board will re-detect the open or shorted sensor circuit as soon as it runs its diagnostic checks. A reset is not a repair and should only be used to confirm whether the fault is persistent. The sensor circuit must be tested and the faulty component replaced to permanently resolve the error.

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