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Error code reference

Bosch Refrigerator Error Code 3-4-7

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Water valve of water dispenser faulty.

First step from the service manual

Check water fill valve of dispenser; if problematic replace; if OK replace icemaker.

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

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What 3-4-7 means on a Bosch refrigerator

Error code 3-4-7 on a Bosch refrigerator indicates a fault detected in the water valve associated with the water dispenser circuit, specifically as it relates to ice maker operation. The control board monitors the dispenser water fill valve for proper electrical function and flow behavior. When the valve fails to respond correctly to control signals, draws incorrect current, or shows an open or short circuit condition, the system logs this fault code and may suspend ice production to prevent further issues.

The water fill valve for the dispenser is an electrically operated solenoid valve that opens to allow water into the ice maker or dispenser when commanded by the control board. Faults typically arise from a failed solenoid coil, a wiring harness issue between the board and valve, or a valve that is mechanically stuck open or closed due to mineral buildup or wear. Corroded terminals at the valve connector are also a common contributor, especially in areas with hard water.

The recommended diagnostic sequence starts with a physical and electrical inspection of the dispenser water fill valve. If the valve checks out as functional, the ice maker assembly itself is the next suspect, as an internal fault within the ice maker module can generate this code even when the valve is intact. Replacing the appropriate component based on test results is the correct resolution path.

Source: manufacturer service documentation.

Common causes of 3-4-7

  1. 01

    Failed dispenser water fill valve solenoid

    Part replacement

    The solenoid coil inside the water fill valve can burn out or develop an open circuit, preventing the valve from opening or closing on command. This is the most common cause of this fault code and typically requires valve replacement.

  2. 02

    Wiring harness or connector damage

    Wiring / connection

    Damaged, pinched, or corroded wiring between the control board and the dispenser water valve can disrupt the electrical signal. Inspect the connector terminals and harness for corrosion, breaks, or loose connections before replacing components.

  3. 03

    Mineral scale buildup blocking valve operation

    Part replacement

    Hard water deposits can cause the valve's internal components to stick, preventing it from opening or closing fully. This can mimic an electrical fault even when the solenoid itself is still functional.

  4. 04

    Faulty ice maker module

    Part replacement

    If the dispenser water fill valve tests as functional, the ice maker assembly itself may have an internal fault that is generating the 3-4-7 code. Bosch's diagnostic procedure identifies the ice maker as the next replacement candidate when the valve is ruled out.

See the test procedure for each cause

Frequently asked questions about 3-4-7

What does 3-4-7 mean on a Bosch refrigerator?
Error code 3-4-7 indicates that the control board has detected a fault with the water fill valve connected to the water dispenser and ice maker system. The valve may have an electrical failure such as an open or shorted solenoid coil, or there may be a wiring issue in that circuit. The refrigerator flags this code to alert you that ice maker operation may be compromised. Diagnosing the valve electrically is the correct first step.
Can I fix error code 3-4-7 myself?
A knowledgeable DIYer can inspect the dispenser water fill valve and its wiring connections for obvious damage or corrosion without special tools. If the valve needs to be replaced, the repair involves disconnecting water lines and electrical connectors, which is manageable for someone comfortable with appliance repairs. However, if the ice maker module itself needs replacement after ruling out the valve, that job is somewhat more involved and may benefit from professional service.
Is it safe to keep using my refrigerator when error code 3-4-7 is showing?
The refrigerator's main cooling function is typically not affected by this fault, so food safety should not be immediately compromised. However, ice production and water dispensing may be interrupted or unreliable while this code is active. It is best to address the fault promptly to avoid any potential for water leakage if the valve is stuck open.
How much does it cost to repair error code 3-4-7 on a Bosch refrigerator?
If only the dispenser water fill valve needs replacement, parts typically range from $30 to $80 depending on the specific model, with professional labor adding $100 to $200 or more. If the ice maker module requires replacement instead, parts can range from $80 to $200 or higher, with similar labor costs. Getting a diagnosis before ordering parts is advisable since either the valve or the ice maker could be the root cause.
Will resetting the refrigerator clear error code 3-4-7?
A reset may temporarily clear the code from the display, but if the underlying valve or ice maker fault is still present, the code will return. Resetting is not a fix for this error. The faulty component needs to be inspected and replaced to resolve the condition permanently.

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