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Error code reference

Miele Dishwasher Error Code F14

Water intake fault at heater pressure switch; with the circulation pump operating after a water intake step…

Miele codesMiele dishwasher codes

Water intake fault at heater pressure switch; with the circulation pump operating after a water intake step, the heater pressure switch does not detect sufficient water pressure.

First step from the service manual

Check for faulty ventilation of water drainage; if the on-site drain connection is lower than the bottom basket's rollers, cut off the cap on the vent valve.

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

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What F14 means on a Miele dishwasher

The F14 error code on a Miele dishwasher indicates a water intake fault detected at the heater pressure switch. Specifically, after a water intake step has completed and the circulation pump is running, the heater pressure switch fails to register adequate water pressure in the system. The heater pressure switch is a safety and monitoring component that confirms sufficient water is present before and during heating cycles. When this switch does not detect the expected pressure, the control board interprets this as a fault condition and halts operation to prevent dry-running damage to the pump and heating element.

The most frequent cause of F14 relates to improper drainage ventilation rather than a failed component. If the on-site drain connection sits lower than the level of the bottom basket's rollers, a siphon effect can continuously draw water out of the tub during the fill and circulation phases. This prevents the system from maintaining enough water volume to satisfy the heater pressure switch. The prescribed first diagnostic step is to cut off the cap on the vent valve to correct this siphoning condition, which allows proper air break in the drain line.

Beyond drainage ventilation issues, F14 can also result from a clogged or restricted water inlet, a malfunctioning inlet valve that limits water flow, a failed or stuck heater pressure switch itself, or internal blockages in the circulation path such as a clogged filter assembly or debris in the pump housing. Systematically working through these possibilities, starting with the drain connection, will identify the root cause in most cases.

Source: manufacturer service documentation.

Common causes of F14

  1. 01

    Siphoning due to low drain connection

    Wiring / connection

    If the household drain connection is positioned lower than the bottom basket rollers, a continuous siphon effect pulls water out of the tub during fill and operation. Cutting the cap off the vent valve breaks the siphon and is the recommended first corrective action.

  2. 02

    Clogged or dirty filter assembly

    Wiring / connection

    A blocked coarse filter, fine filter, or micro-filter at the bottom of the tub can restrict water circulation to a level where the heater pressure switch never receives adequate pressure. Inspect and clean the full filter assembly thoroughly.

  3. 03

    Faulty or restricted water inlet valve

    Part replacement

    If the water inlet valve is partially blocked or not opening fully, the dishwasher will not fill with enough water to satisfy the heater pressure switch during circulation. Check for adequate water supply pressure and test the inlet valve for proper operation.

  4. 04

    Failed heater pressure switch

    Part replacement

    The heater pressure switch itself may be defective, stuck, or have a damaged sensing line, causing it to fail to report correct pressure even when water levels are normal. The switch will need to be tested and replaced if found faulty.

  5. 05

    Circulation pump blockage or failure

    Wiring / connection

    Debris lodged in the circulation pump impeller can reduce water flow to a point where system pressure remains too low for the heater pressure switch to trigger. Inspect the pump housing for obstructions and confirm the pump is running at full capacity.

See the test procedure for each cause

Frequently asked questions about F14

What does F14 mean on a Miele dishwasher?
F14 on a Miele dishwasher signals a water intake fault at the heater pressure switch. After the dishwasher completes a water intake step and starts the circulation pump, the heater pressure switch does not detect sufficient water pressure. The machine stops to protect the pump and heating element from running without adequate water. This is most commonly caused by a siphoning issue with the drain connection rather than a failed internal part.
How do I fix an F14 error on my Miele dishwasher?
Start by checking whether your drain connection is positioned lower than the bottom basket rollers, as this creates a siphon that continuously empties the tub. If so, locate the vent valve and cut off its cap to introduce an air break in the drain line. If that does not resolve the error, clean the filter assembly, inspect the water supply and inlet valve, and check the circulation pump for obstructions. If the problem persists, the heater pressure switch itself may need to be tested and replaced.
Is it safe to continue using my dishwasher with an F14 error?
You should not continue running the dishwasher while the F14 error is active. The error indicates the system cannot confirm adequate water is present during the heating phase, which poses a risk of damage to both the circulation pump and the heating element if they operate dry. Stop use and address the underlying cause before running another cycle.
Will resetting the dishwasher clear an F14 error?
A reset may temporarily clear the F14 code, but if the underlying condition has not been corrected, the error will return as soon as the machine attempts another fill and circulation sequence. Address the root cause first, such as fixing the drain connection or cleaning the filters, before attempting a reset. A reset alone is not a repair.
How much does it cost to repair an F14 error on a Miele dishwasher?
Repair costs vary significantly depending on the cause. If the fix involves only adjusting the drain connection or cutting the vent valve cap, there may be no parts cost at all. Cleaning the filter assembly is also a no-cost repair. If the inlet valve or heater pressure switch needs replacement, parts and labor combined could range from around 100 to 350 dollars or more, depending on your location and whether you hire a technician.

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