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Error code reference

Bosch Refrigerator Error Code 6-1-3

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Water tank temperature sensor (NTC) faulty.

First step from the service manual

Check tank temperature sensor; if sensor OK, check door electronics.

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

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What 6-1-3 means on a Bosch refrigerator

Error code 6-1-3 on a Bosch refrigerator indicates a fault detected in the water tank temperature sensor (NTC) within the ice maker system. The NTC (Negative Temperature Coefficient) thermistor monitors the temperature of the water tank that supplies the ice maker. This sensor changes electrical resistance in response to temperature: as temperature drops, resistance rises, and as temperature rises, resistance falls. The refrigerator's control electronics read this resistance to determine water tank conditions and regulate ice production accordingly.

When the control system detects a resistance value outside the expected range, either an open circuit, a short circuit, or an implausible reading, it logs fault code 6-1-3. Common physical causes include a damaged or corroded sensor connector, a break in the sensor wiring harness, or a failed NTC element itself. Prolonged exposure to moisture in the ice maker compartment can accelerate connector corrosion and lead to intermittent or permanent signal loss.

The recommended diagnostic sequence begins with inspecting and testing the water tank temperature sensor directly. If the sensor checks out electrically within its expected resistance range, the fault likely originates in the door electronics module, which processes the sensor signal. This two-step approach helps isolate whether the problem is a failed sensor, a wiring issue between the sensor and door board, or a faulty door electronics board that is misreading an otherwise functional sensor.

Source: manufacturer service documentation.

Common causes of 6-1-3

  1. 01

    Failed NTC temperature sensor

    Part replacement

    The NTC thermistor itself may have failed internally, producing a resistance value outside the acceptable range or no signal at all. Testing the sensor with a multimeter and comparing the resistance reading to the expected value at a known temperature will confirm this.

  2. 02

    Corroded or loose sensor connector

    Wiring / connection

    Moisture in the ice maker area can corrode the connector pins that link the NTC sensor to the wiring harness, causing an intermittent or open circuit. Inspect the connector for green or white oxidation and ensure it is fully seated.

  3. 03

    Damaged wiring harness

    Part replacement

    The wiring between the water tank sensor and the door electronics board can develop breaks or shorts, especially at points where the harness bends during door opening and closing. A continuity check along the harness will reveal any open circuits.

  4. 04

    Faulty door electronics board

    Part replacement

    If the sensor and wiring test correctly, the door electronics module may be misinterpreting the sensor signal or have a failed input circuit. This is diagnosed by process of elimination after confirming the sensor and harness are functional.

See the test procedure for each cause

Frequently asked questions about 6-1-3

What does 6-1-3 mean on a Bosch refrigerator?
Error code 6-1-3 indicates that the ice maker's water tank temperature sensor (NTC thermistor) has been detected as faulty by the refrigerator's control system. The sensor is responsible for monitoring the water temperature in the tank that feeds the ice maker. When the sensor signal falls outside expected parameters, the refrigerator logs this code and ice maker operation is typically disrupted.
Can I fix the 6-1-3 error code myself?
A knowledgeable DIYer can start by inspecting the sensor connector for corrosion or loose fit and checking the wiring harness for visible damage. Testing the NTC sensor with a multimeter requires some familiarity with resistance measurements. If the sensor and wiring are intact, replacing the door electronics board is a more advanced repair that some homeowners may prefer to leave to a technician.
Is it safe to keep using my refrigerator while error code 6-1-3 is active?
The refrigerator's main cooling and food preservation functions typically remain operational during a 6-1-3 fault, as the error is specific to the ice maker water tank sensor. However, ice production may stop or become unreliable. It is advisable to address the fault promptly to avoid any secondary issues from the ice maker operating without proper temperature monitoring.
How much does it cost to repair a Bosch refrigerator with a 6-1-3 error?
If the fix is simply cleaning or reseating a corroded connector, out-of-pocket costs can be minimal. Replacing the NTC sensor itself generally costs in the range of $15 to $60 for the part. If the door electronics board requires replacement, parts alone can range from $80 to $200 or more, with professional labor adding additional cost depending on your location and the service provider.
Will resetting my Bosch refrigerator clear the 6-1-3 error code?
A power reset may temporarily clear the error code from the display, but if the underlying sensor or wiring fault is still present, the code will return once the control system completes its diagnostic cycle. A lasting fix requires identifying and correcting the root cause, whether that is a failed sensor, a damaged harness, or a faulty door electronics board.

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