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Error code reference

Miele Washer Error Code F4139

Relay contact 13/14 on 1K1/1 and/or 2K1/1 open-circuited during heating phase; heating continues but fault…

Miele codesMiele washer codes

Relay contact 13/14 on 1K1/1 and/or 2K1/1 open-circuited during heating phase; heating continues but fault indicated if no temperature increase after 3 min.

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What F4139 means on a Miele washer

Error code F4139 on a Miele washer indicates that relay contact 13/14 on relay block 1K1/1 and/or 2K1/1 has developed an open circuit condition during the heating phase of a wash cycle. These relay contacts are part of the control circuitry responsible for switching power to the heating element. When the relay contact fails to close or loses continuity mid-cycle, the circuit is interrupted, which the machine detects and logs as a fault. Importantly, the machine does not immediately stop heating. Instead, it allows the heating process to continue while monitoring the water temperature.

The fault is only confirmed and displayed if no measurable temperature increase is detected within 3 minutes of the open-circuit condition being identified. This delay logic distinguishes between a transient contact issue and a genuine heating failure. If the water temperature does rise despite the relay fault, the machine may continue operating but will still flag the condition for service attention. This makes F4139 both a component fault code and a functional performance warning.

Common causes include relay contact degradation due to arcing over time, failed solder joints on the relay terminals of the control board, or a defective relay block that no longer transfers current reliably through contacts 13 and 14. The control board housing these relay assemblies, specifically the 1K1/1 and 2K1/1 relay positions, is the primary area to inspect. A failed heating element that draws excessive current can also accelerate relay contact wear and lead to this type of open-circuit failure.

Source: manufacturer service documentation.

Common causes of F4139

  1. 01

    Worn or pitted relay contacts on the control board

    Part replacement

    Relay contacts 13/14 on the 1K1/1 and/or 2K1/1 relay blocks can degrade over time due to repeated arcing and electrical stress. Inspection of the relay terminals under magnification may reveal pitting, carbon deposits, or physical separation of the contact surfaces.

  2. 02

    Failed solder joints at the relay terminals

    Wiring / connection

    Cold or cracked solder joints at the relay mounting points on the control board can cause intermittent or permanent open-circuit conditions. Visually inspecting the board for lifted or fractured solder joints around the 1K1/1 and 2K1/1 relay positions can confirm this cause.

  3. 03

    Defective relay block 1K1/1 or 2K1/1

    Part replacement

    The relay itself may have an internal mechanical or electrical failure, preventing contacts 13/14 from closing under normal operating conditions. Continuity testing across the relay contacts while the relay is energized can confirm whether the relay is functioning correctly.

  4. 04

    Heating element failure causing excessive current draw

    Part replacement

    A partially failed heating element drawing abnormal current can accelerate relay contact wear and eventually cause open-circuit faults. Resistance testing of the heating element can help determine if it contributed to the relay contact failure.

  5. 05

    Faulty control board

    Part replacement

    If individual relay replacement or resoldering does not resolve the fault, the entire control board assembly may need to be replaced due to broader circuit damage in the heating control section.

See the test procedure for each cause

Frequently asked questions about F4139

What does F4139 mean on a Miele washer?
F4139 indicates that relay contact 13/14 on relay block 1K1/1 and/or 2K1/1 has developed an open-circuit condition during the heating phase of the wash cycle. The washer monitors water temperature after detecting this fault, and the error is confirmed if no temperature increase occurs within 3 minutes. This points to a failure in the relay circuitry on the control board that controls power delivery to the heating element.
Can I fix F4139 on my Miele washer myself?
Some experienced DIYers with electronics knowledge may be able to inspect the control board for failed solder joints and reflow them, which can resolve the fault without replacing parts. However, diagnosing and replacing relay components or a control board involves working with mains voltage components and requires disassembly of the machine. Most homeowners should have a qualified appliance technician perform this repair.
Is it safe to keep using my Miele washer with error code F4139?
The washer may continue to operate and even complete cycles when F4139 is present, since heating continues as long as a temperature rise is detected. However, an open relay contact is an electrical fault that can worsen over time or cause related component damage. Continued use is not recommended until the relay circuit has been properly inspected and repaired.
How much does it cost to repair a Miele washer showing F4139?
Repair costs vary depending on whether the issue is a resolderable joint, a replacement relay, or a full control board replacement. Labor and parts for a control board repair or relay replacement on a Miele washer typically range from $150 to $500 or more, depending on your region and the specific parts required. Getting a diagnostic assessment from a Miele-trained technician will give you the most accurate estimate.
Will resetting my Miele washer clear the F4139 error code?
A reset may temporarily clear the F4139 code from the display, but the underlying relay contact fault will remain. If the open-circuit condition persists in the relay circuitry, the error will return during the next heating phase. A reset is not a fix and should not substitute for proper diagnosis and repair of the relay or control board.

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