Washer Low Severity
F138 Miele Error Code

Detergent Dispenser Fault

The F138 error code means the detergent dispenser mechanism in your Miele washing machine is not operating correctly. The motorized dispenser or the TwinDos automatic dispensing system has reported a fault.

~55%

DIY Fixable

$80-300

Typical Repair Cost

15 min – 1 hr

Pro Repair Time

Quick Assessment

Answer to continue safely

Is it safe to keep using?

Yes. F138 does not prevent the machine from running. You can add detergent manually to the drawer and run cycles normally while troubleshooting the dispenser.

Can I reset the code?

Yes. Yes. Clean the dispenser, check/replace the cartridge, and reset at mains for 5 minutes.

When to stop immediately?

Stop if you notice: The dispenser drawer is completely stuck, Detergent leaks from the drawer during cycle.

Symptoms You May Notice

Detergent not dispensed

Clothes come out with stains because detergent was never released

TwinDos indicator light on

The automatic dosing system shows a warning

Dispenser drawer stuck

The motorized drawer does not open or close properly

F138 appears early in cycle

The code triggers when the dispenser should activate

Possible Causes

1

Empty TwinDos Cartridge

The automatic detergent cartridge is empty or not inserted properly.

DIY Possible
2

Clogged Dispenser

Dried detergent residue has blocked the dispenser mechanism.

DIY Possible
3

Motorized Drawer Jammed

The motor that opens/closes the dispenser drawer is blocked.

Requires Professional
4

TwinDos Pump Fault

The dosing pump that measures detergent from the cartridge has failed.

Requires Professional
5

Sensor or Wiring Fault

The dispenser position sensor or its wiring has failed.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Check TwinDos Cartridge

    If your model has TwinDos, check if the cartridge is empty, expired, or improperly seated. Replace or reseat as needed.

    Press the cartridge firmly until it clicks into place.

  2. 2

    Clean the Dispenser Drawer

    Remove the detergent drawer (press the release tab). Wash thoroughly under warm water, cleaning all compartments and the housing cavity.

    Use a small brush to remove dried detergent buildup.

  3. 3

    Check for Obstructions

    With the drawer removed, look inside the cavity. Remove any solid detergent chunks or foreign objects.

    A flashlight helps see into the back of the cavity.

  4. 4

    Power Reset

    Turn off at mains for 5 minutes. The dispenser motor controller may need to reinitialize.

    After reset, try opening and closing the drawer to see if the motor works.

  5. 5

    Try Manual Dosing

    If TwinDos is not working, you can disable it and add detergent manually to the drawer as a temporary workaround.

    Check your manual for how to switch between TwinDos and manual dosing.

When to Call a Professional

Contact a qualified Miele technician if:

  • TwinDos pump has failed
  • Dispenser motor is jammed or burned out
  • Sensor wiring is damaged
  • Under warranty

Need Professional Help?

Find qualified Miele technicians in your area for proper diagnostics and repair.

Schedule Appointment

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