mypros+
Error code reference

Miele Washer Error Code F4038

Water level less than programmed; if water level remains below minimum, heating will not be activated.

Miele codesMiele washer codes

Water level less than programmed; if water level remains below minimum, heating will not be activated.

MyPros+ Max

Get the full diagnostic procedure for F4038.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F4038 means on a Miele washer

F4038 on a Miele washer indicates that the water level inside the drum has fallen below the programmed threshold for the selected wash cycle. The machine continuously monitors water level through a pressure sensor (also called a pressure switch or pressostat), which sends feedback to the control board. When the detected level does not reach the minimum required point, the control board logs this fault and suspends heating activation as a protective measure. This prevents the heating element from running dry, which could cause overheating or element failure.

The most common causes involve water supply issues, pressure system faults, or drainage problems occurring during fill. A kinked or blocked inlet hose, a partially closed water supply valve, or low household water pressure can all prevent the drum from reaching the correct fill level. The pressure sensor hose, which connects the drum to the pressostat, can develop cracks, blockages, or loose connections that cause inaccurate level readings even when sufficient water is present.

A faulty pressure sensor itself can also misreport the water level to the control board. Additionally, if the drain pump is running intermittently or the drain hose is positioned too low, water may siphon out during the fill phase, keeping the level below the minimum threshold. Identifying whether the drum is actually underfilled or whether the sensor system is providing a false reading is the critical first step in diagnosing this fault.

Source: manufacturer service documentation.

Common causes of F4038

  1. 01

    Low or restricted water supply

    Wiring / connection

    A partially closed inlet valve, kinked supply hose, or low household water pressure can prevent the drum from filling to the required level. Check that the supply valve is fully open and that the inlet hose has no kinks or blockages.

  2. 02

    Blocked or clogged inlet filter screens

    Wiring / connection

    Miele washers have mesh filter screens at the inlet valve connection points that can collect sediment over time. A clogged screen restricts water flow and slows or limits fill volume. These screens can be removed and cleaned.

  3. 03

    Faulty or disconnected pressure sensor hose

    Wiring / connection

    The small rubber hose connecting the drum to the pressure sensor can crack, become blocked with residue, or slip off its connections. This causes the pressostat to report an incorrect water level even if the drum is filling normally.

  4. 04

    Defective pressure sensor (pressostat)

    Part replacement

    If the pressure sensor itself has failed, it will send inaccurate signals to the control board regardless of the actual water level in the drum. A failed pressostat typically requires replacement.

  5. 05

    Siphoning due to incorrect drain hose positioning

    Wiring / connection

    If the drain hose is positioned too low or does not have the proper anti-siphon loop, water can drain out continuously during the fill phase, preventing the drum from reaching the minimum level. The drain hose standpipe height should be checked against the installation requirements.

See the test procedure for each cause

Frequently asked questions about F4038

What does F4038 mean on a Miele washer?
F4038 means the washer detected that the water level inside the drum is below the minimum threshold programmed for the selected cycle. As a protective measure, the machine will not activate the heating element until the correct water level is reached. This fault points to a problem with water filling, the pressure sensing system, or possible siphoning of water out of the drum during the fill phase.
Can I fix F4038 on my Miele washer myself?
Several of the most common causes can be addressed without professional help. Start by checking that the water supply valve is fully open, the inlet hose is not kinked, and the inlet filter screens are clean. Also verify the drain hose is positioned at the correct height to prevent siphoning. If these checks do not resolve the fault, the pressure sensor hose or the pressostat itself may need inspection or replacement, which can require more technical confidence.
Is it safe to run my Miele washer when F4038 is displayed?
The washer has already built in a safety response by disabling the heater when the water level is too low, which prevents the heating element from overheating. However, continuing to run cycles with this fault active may not clean laundry properly and can stress other components. It is best to diagnose and resolve the underlying cause before resuming normal use.
Will resetting the washer clear the F4038 error?
A reset may temporarily clear the fault display, but if the underlying problem with water fill or the pressure sensing system is not corrected, the error will return during the next cycle. Clearing the code without fixing the root cause does not resolve the issue. Focus on diagnosing the fill and pressure sensor components first.
How much does it cost to repair a Miele washer showing F4038?
If the fix involves cleaning inlet screens or repositioning the drain hose, there may be no parts cost at all. If the pressure sensor hose needs replacement, parts are generally inexpensive, typically in the range of $10 to $30. A faulty pressostat replacement part can range from $30 to $100 or more depending on the specific model, and professional labor costs will add to that total if a technician is required.

Related Miele washer codes

All Miele washer codes
View all 254 Miele washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass