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Error code reference

Bosch Refrigerator Error Code 3-4-8

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Hopper flap solenoid faulty.

First step from the service manual

Check solenoid; 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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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 3-4-8 means on a Bosch refrigerator

Error code 3-4-8 on a Bosch refrigerator indicates a fault detected in the hopper flap solenoid within the ice maker assembly. The hopper flap is a small door or gate mechanism that controls the release of ice from the storage hopper into the dispenser chute. This flap is actuated by a solenoid, which is an electromechanical coil that converts electrical current into linear or rotational mechanical movement. When the control board sends a signal to open or close the flap and receives feedback indicating the solenoid is not responding correctly, either through an out-of-range resistance reading, a short circuit, or an open circuit condition, it logs this fault code.

The most common causes of this fault are a failed solenoid coil, damaged wiring in the harness connecting the solenoid to the control board, or a mechanical obstruction preventing the solenoid from actuating freely. Ice buildup around the flap mechanism can also place excessive load on the solenoid, causing it to draw abnormal current and trigger the fault. In some cases, a failing control board may send incorrect signals to the solenoid, mimicking a solenoid fault even when the component itself is intact.

Diagnosis begins by physically inspecting and electrically testing the hopper flap solenoid. If the solenoid measures an open circuit or a shorted coil when tested with a multimeter, it should be replaced. If the solenoid tests within normal parameters and the wiring harness shows no damage, the fault likely originates in the ice maker assembly itself, and replacing the complete ice maker unit is the recommended corrective action.

Source: manufacturer service documentation.

Common causes of 3-4-8

  1. 01

    Failed hopper flap solenoid coil

    Part replacement

    The solenoid coil can burn out or develop an open or short circuit over time. Testing the solenoid with a multimeter will reveal an out-of-range or infinite resistance reading if the coil has failed.

  2. 02

    Damaged or corroded wiring harness

    Wiring / connection

    The wires connecting the solenoid to the ice maker control board can crack, fray, or corrode, especially in the cold, moist environment near the ice maker. Inspect the harness for visible damage and check connector pins for corrosion or looseness.

  3. 03

    Ice buildup around the hopper flap

    Wiring / connection

    Ice accumulation can physically jam the flap mechanism, causing the solenoid to overwork and trigger a fault. Inspect the hopper area for ice obstructions and defrost the assembly if needed.

  4. 04

    Faulty ice maker assembly

    Part replacement

    If the solenoid and wiring both test correctly, the fault may originate within the ice maker module itself. In this case, replacing the entire ice maker assembly is the appropriate repair.

  5. 05

    Control board sending incorrect signals

    Part replacement

    A malfunctioning control board may fail to send the correct voltage or signal to the solenoid, producing a fault even when the solenoid is undamaged. This is the least common cause and should be considered only after the solenoid and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about 3-4-8

What does 3-4-8 mean on a Bosch refrigerator?
Error code 3-4-8 on a Bosch refrigerator indicates a fault with the hopper flap solenoid in the ice maker. The solenoid controls the flap that releases ice from the storage hopper into the dispenser chute. When the refrigerator detects that this solenoid is not functioning correctly, it stores this code and may disable ice dispensing. Diagnosis involves testing the solenoid electrically and, if it passes, replacing the ice maker unit.
Can I fix error code 3-4-8 on my Bosch refrigerator myself?
A knowledgeable DIYer can address this fault by first inspecting the hopper flap area for ice jams and clearing any obstructions. Testing the solenoid with a multimeter requires some electrical knowledge, but is within reach for someone comfortable with basic appliance diagnostics. If the solenoid tests as faulty, replacing it or the ice maker assembly involves disconnecting power, removing the ice maker unit, and swapping the component. If you are not comfortable working with electrical components, a qualified technician is recommended.
Is it safe to keep using my Bosch refrigerator when error code 3-4-8 is active?
The refrigerator's cooling and food preservation functions are generally not affected by this error code, as it is isolated to the ice maker's dispensing mechanism. However, ice dispensing may not work reliably. There is no immediate safety hazard to the refrigerator or its contents, but the fault should be addressed to prevent further wear on related components.
How much does it cost to repair error code 3-4-8 on a Bosch refrigerator?
If only the solenoid requires replacement, parts costs are typically in the range of $15 to $60 depending on the specific model. If the entire ice maker assembly needs to be replaced, parts can range from $80 to $250. Adding professional labor, total repair costs generally fall between $100 and $350. Costs vary based on your location and the specific Bosch model involved.
Will resetting my Bosch refrigerator clear the 3-4-8 error code?
A reset may temporarily clear the error code from the display, but the fault will return if the underlying problem with the hopper flap solenoid or ice maker has not been resolved. Resetting the unit is not a substitute for diagnosing and repairing the faulty component. Persistent or recurring appearances of code 3-4-8 after a reset confirm that a physical repair is necessary.

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