3-Way Valve Motor Junkers Euromaxx ZWC 28-1 MFA 23 Ref. 8717204345
RefurbishedJunkers3-way valves

3-Way Valve Motor Junkers Euromaxx ZWC 28-1 MFA 23 Ref. 8717204345

Stock · 3 units

Three-way valve motor for Junkers Euromaxx boilers ZWC 24-1 and 28-1 (MFA/MFK) and other models in the range, such as ZBS11, ZSB722A23, or ZWB726A23. Reference 8717204345, confirmed on the label and by two independent external sources. Operates at 24V, 50Hz. It moves the valve between heating and domestic hot water; it is replaced when the motor does not turn, makes noise, or the boiler does not switch modes correctly.

VAT included

Compatibility

Junkers boilers compatible with reference 8717204345

Three-way valve with reference 8717204345. Six confirmed compatibilities: ZWC 28-1 MFA and ZWC 28/32-1 MFA.

Proven compatibility

Boiler modelFamilyVerification
Junkers ZWC 28-1 MFAEuromaxx ZWCContrasted
Junkers ZWC 28/32-1 MFAEuromaxx ZWCContrasted
Junkers ZWC 24-1 MFKEuromaxx ZWCContrasted
Junkers ZWC 24-1 MF2AEuromaxx ZWCContrasted
Junkers ZWC 28-1 MF2AEuromaxx ZWCContrasted
Junkers ZWC 28-1 MF2KEuromaxx ZWCContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if ref. 8717204345 is the part for your boiler

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 8717204345. If it is not visible, do not identify the part from its shape alone.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms and faults that the 3-way valve 8717204345 resolves.

The 3-way valve diverts water between heating and domestic hot water. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The boiler does not switch correctly between heating and domestic hot water.

    Cause: The motor of the 3-way valve does not complete its rotation and gets stuck between the two positions.

    Open a hot water tap and listen for the motor trying to start; a buzzing sound without movement indicates a fault in the motor.

  • 02

    The motor does not turn or gets stuck halfway.

    Cause: The internal gear is worn out or the shaft is blocked by scale.

    With the boiler turned off and cold, check if the valve shaft moves by hand; if it is stuck, confirm the fault.

  • 03

    A noise or clicking sound is heard in the gas valve when changing position.

    Cause: The coupling between the motor and the valve body is worn or misaligned.

    Check that the motor is properly secured and aligned with the body of the gas valve.

  • 04

    There is no hot water or heating depending on which path is open.

    Cause: The valve has become stuck in one position and does not change even with demand.

    Create a demand for domestic hot water and another for heating separately and observe if the deviation changes direction.

Fault codes from Junkers that this part resolves.

CodeFaultDiagnosis and solution
AAExcessive temperature difference between the heating flow circuit and the domestic hot water (DHW)The motor of the 3-way valve (8717204345) does not switch or makes poor contact in its white connector, leaving the boiler in a single circuit and causing that differential; check by manually activating the V3V/test and measuring that 24 V reach the motor and that it rotates/switches between DHW and heating.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Technical data

Data sheet for the Junkers 8717204345 three-way valve.

Catalogue reference
8717204345
Brand
Junkers
Type of part
3-way valves
Units in stock
3 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

Component code
8717204345
Voltage
24V
Frequency
50Hz
Thermal class
T70
Batch marking / date
16540000.04 / 96.440121 T70 / 60731 483011
Frequently Asked Questions

Frequently asked questions about the 3-way valve 8717204345

What fault does replacing the motor of the 3-way valve of the Junkers Euromaxx ZWC 28-1 MFA 23 resolve?
It is replaced when the motor does not turn, makes noise, or the boiler does not switch correctly between heating and domestic hot water.
What voltage does the motor of the gas valve 8717204345 from the Junkers Euromaxx ZWC 28-1 MFA 23 operate on?
At 24V and 50Hz, according to the label.
Is this valve motor compatible with other models in the Euromaxx range?
Yes, it is compatible with the models ZWC 28/32-1 MFA, ZWC 24-1 MFK, ZWC 24-1 MF2A, ZWC 28-1 MF2A, and ZWC 28-1 MF2K.
How do I know if the reference 8717204345 is correct for my valve motor?
It is confirmed on the part's label and verified by two independent external sources.
What fault code is documented for this valve motor?
The documented fault code is AA.
What is the reference for the 3-way valve motor for the Junkers Euromaxx ZWC 28-1 MFA 23?
The reference is MV3VJE28/3223.

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3-Way Valve Motor Junkers Euromaxx ZWC 28-1 MFA 23 Ref. 8717204345