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Error code reference

Bosch Refrigerator Error Code F43

Required water height in the water bowl was not reached after a water inlet time of 3 minutes.

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Required water height in the water bowl was not reached after a water inlet time of 3 minutes.

First step from the service manual

Check water supply, water valve operation, supply hose in the water bowl for freezing, and water electrode detection.

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

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What F43 means on a Bosch refrigerator

The F43 error code on a Bosch refrigerator indicates that the water bowl did not reach the required water level within a 3-minute inlet window. This code is tied to the automatic ice-making or water dispensing system, where a water inlet valve opens to fill a designated water bowl to a specific height. A water electrode sensor monitors the water level, and if the target height is not detected before the 3-minute timer expires, the control board logs F43 and halts the fill cycle to prevent overflow or dry-running of downstream components.

The system relies on several components working in sequence: adequate household water pressure feeding through the supply hose, a functioning water inlet solenoid valve that opens fully on command, an unobstructed supply hose that routes water into the bowl, and a water electrode sensor that accurately detects the water surface. A failure or restriction at any one of these points can prevent the bowl from filling in time.

Freezing of the supply hose inside the refrigerator compartment is a particularly common cause in this system, as the hose routes through areas that can drop below freezing if airflow or insulation is compromised. The water electrode is also worth close inspection: mineral deposits or scale buildup on the electrode tip can prevent accurate water detection, causing the control board to register a low-level condition even when some water is present. Addressing F43 typically involves a systematic check of water pressure, valve operation, hose condition, and electrode continuity.

Source: manufacturer service documentation.

Common causes of F43

  1. 01

    Insufficient household water pressure or supply shutoff

    Wiring / connection

    If the refrigerator's water supply valve is partially closed or household pressure is too low, the inlet valve cannot deliver enough water within the 3-minute window. Check that the dedicated shutoff valve behind or beneath the refrigerator is fully open and that water flows freely when the supply line is disconnected.

  2. 02

    Frozen supply hose inside the refrigerator

    Wiring / connection

    The hose routing water into the bowl can freeze if the surrounding compartment temperature drops too low, completely blocking flow. Inspect the hose for ice blockage and check for airflow or door seal issues that may be causing abnormally cold temperatures in that area.

  3. 03

    Failed or restricted water inlet valve

    Part replacement

    The solenoid-operated water inlet valve may be defective, partially clogged with sediment, or not receiving the correct voltage signal from the control board. If the valve does not open fully, water flow will be too slow to reach the required height in 3 minutes. Valve screens should be checked for debris, and valve solenoid function should be verified.

  4. 04

    Faulty or contaminated water electrode sensor

    Wiring / connection

    The water electrode detects when the bowl has reached the required water height. Mineral scale or lime deposits on the electrode tip can insulate it from the water surface, causing the control to read a low-level condition even if water is present. Clean the electrode tip and verify its detection function.

  5. 05

    Kinked or blocked supply hose

    Part replacement

    A kinked, pinched, or internally blocked supply hose will restrict water flow into the bowl regardless of pressure or valve operation. Inspect the full length of the supply hose from the household connection to the water bowl inlet for physical damage or blockage.

See the test procedure for each cause

Frequently asked questions about F43

What does F43 mean on a Bosch refrigerator?
F43 means the refrigerator's water bowl did not reach the required water level within the 3-minute inlet period. The control board monitors water height through an electrode sensor, and if the target level is not detected in time, the fill cycle stops and F43 is logged. The most common causes are low water pressure, a frozen supply hose, a failing inlet valve, or a contaminated water electrode sensor.
Can I fix the F43 error myself?
Some causes of F43 are DIY-friendly, such as verifying that the supply shutoff valve is fully open, checking for a kinked hose, or thawing a frozen supply line. Cleaning mineral deposits off the water electrode is also a task many homeowners can handle. However, replacing the water inlet valve or diagnosing control board issues generally requires a qualified appliance technician.
Is it safe to continue using my refrigerator while it shows F43?
The refrigerator's cooling function is typically unaffected by F43, so food storage should remain safe in the short term. However, the ice maker and water dispenser will not operate correctly while the fault is active. It is best to address the fault promptly to avoid secondary issues like a frozen or burst water line.
Will resetting the refrigerator clear the F43 error?
A power reset may temporarily clear the F43 code, but the error will return the next time the refrigerator attempts a fill cycle if the underlying problem has not been fixed. Resetting without repairing the root cause is not a solution. The fault must be corrected at the source before the code will stay cleared permanently.
How much does it cost to repair a Bosch refrigerator F43 error?
Repair costs vary depending on the root cause. If the fix is simply opening a supply valve or thawing a hose, there may be no parts cost and minimal labor. Replacing a water inlet valve typically runs in the range of $80 to $200 including parts and labor. If the water electrode sensor or a control board component needs replacement, costs can be higher, generally ranging from $150 to $400 depending on parts availability and service rates in your area.

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