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Error code reference

Bosch Refrigerator Error Code 3-1-8

Ice maker

Bosch codesBosch refrigerator codes

Ice maker: Hopper flap solenoid faulty.

First step from the service manual

Check solenoid; if problematic replace solenoid; if solenoid 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 3-1-8 means on a Bosch refrigerator

Error code 3-1-8 on a Bosch refrigerator indicates a fault in the ice maker's hopper flap solenoid. The hopper flap is a small door or gate within the ice maker assembly 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 detects that the solenoid is not responding correctly, either due to an open circuit, short circuit, or mechanical binding, it logs this fault code.

The solenoid itself can fail in several ways. The internal coil winding can burn out or break, resulting in an open circuit and no movement. Alternatively, the coil can develop a short, causing excessive current draw. The plunger or mechanical linkage connected to the solenoid can also bind or seize, preventing the flap from moving even if the solenoid receives proper voltage. In any of these scenarios, the ice dispenser will not function correctly because the flap cannot open or close on command.

Diagnosis begins with a direct inspection and electrical test of the solenoid. Checking for proper resistance across the solenoid terminals and confirming the coil is neither open nor shorted is the primary step. If the solenoid checks out electrically but the flap still does not operate, the problem may lie in the broader ice maker assembly, and replacing the complete ice maker unit would be the recommended corrective action.

Source: manufacturer service documentation.

Common causes of 3-1-8

  1. 01

    Failed solenoid coil

    Part replacement

    The wire coil inside the hopper flap solenoid can burn out or break, creating an open circuit. This is the most common cause and can be confirmed by measuring resistance across the solenoid terminals and finding an out-of-spec or infinite reading.

  2. 02

    Shorted solenoid winding

    Part replacement

    The solenoid coil can develop an internal short, causing abnormal current draw that the control board detects as a fault. A resistance measurement significantly lower than expected indicates a shorted winding.

  3. 03

    Mechanical binding of the flap or plunger

    Wiring / connection

    Ice buildup, debris, or a worn linkage can prevent the flap from moving freely even when the solenoid receives power. Inspect the flap mechanism for obstructions or physical damage.

  4. 04

    Wiring or connector issue

    Wiring / connection

    A loose, corroded, or damaged connector at the solenoid or along the wiring harness can interrupt the signal and trigger this code. Inspect the harness and connectors for visible damage or corrosion.

  5. 05

    Failed ice maker assembly

    Part replacement

    If the solenoid and wiring test as normal, the fault may originate within the ice maker assembly's internal control circuitry. In this case, replacing the complete ice maker unit is the recommended repair.

See the test procedure for each cause

Frequently asked questions about 3-1-8

What does 3-1-8 mean on a Bosch refrigerator?
Error code 3-1-8 on a Bosch refrigerator indicates that the ice maker's hopper flap solenoid is faulty. The hopper flap solenoid controls a small gate that releases ice into the dispenser chute. When the control board detects an electrical or mechanical problem with that solenoid, it logs this code and ice dispensing may stop working.
How do I fix error code 3-1-8 on my Bosch refrigerator?
The first step is to test the hopper flap solenoid directly by checking its resistance and confirming there is no open circuit or short. If the solenoid is faulty, replacing it should clear the error. If the solenoid tests as electrically sound but the problem persists, replacing the entire ice maker assembly is the next recommended step.
Will resetting my Bosch refrigerator clear error code 3-1-8?
A reset may temporarily clear the code from the display, but it will return if the underlying hardware fault is not corrected. The solenoid or ice maker assembly must be repaired or replaced to resolve the fault permanently. Resetting without addressing the root cause is not a lasting solution.
Is error code 3-1-8 on a Bosch refrigerator a safety concern?
This fault is not a safety hazard in the traditional sense. It does not involve high-voltage components, refrigerant leaks, or fire risk. However, leaving it unaddressed will result in continued failure of the ice dispenser, and in some cases ice may back up within the unit.
How much does it cost to repair error code 3-1-8 on a Bosch refrigerator?
Repair costs depend on whether only the solenoid needs replacement or the entire ice maker assembly must be swapped out. Solenoid replacement is generally the less expensive option, with parts and labor typically ranging from $75 to $200. If a full ice maker assembly replacement is needed, total costs including labor can range from $200 to $450 or more depending on your location and service provider.

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