Junkers 3-Way Valve Motor Euromaxx ZWC 28 1MFK 23 Ref. 8716771303
Refurbished Junkers 3-way valves

Junkers 3-Way Valve Motor Euromaxx ZWC 28 1MFK 23 Ref. 8716771303

The 3-way valve with motor from Junkers Euromaxx switches the water between the heating circuit and the domestic hot water circuit. When it fails, you may notice that there is hot water but no heating, or vice versa, and there may even be a mixing of both circuits. This valve is compatible with several models of Junkers Euromaxx, such as ZWC28-1MFK, ZWC28-1MFA, and ZWC24-1MFK, among others. If you experience fault code AA, which indicates an excessive temperature difference between the circuits, it is time to replace this part. The manufacturer reference is 8716771303.

Type of part
3-way valves
Status
Refurbished
Catalogue reference
8716771303
Warranty
1 year
VAT included Stock · 3 units
Compatibility

Junkers boilers compatible with reference 8716771303

Three-way valve with reference 8716771303. Eight confirmed compatibilities: ZWC28-1MF2A and ZWC28-1MFA.

Verified compatibility

Boiler modelFamilyVerification
Junkers ZWC28-1MF2AJunkers EuromaxxVerified
Junkers ZWC28-1MFAJunkers EuromaxxVerified
Junkers ZWC28-1MFKJunkers EuromaxxVerified
Junkers ZWC24-1MF2AJunkers EuromaxxVerified
Junkers ZWC24-1MFAJunkers EuromaxxVerified
Junkers ZWC24-1MFKJunkers EuromaxxVerified
Junkers ZC28-1MFAJunkers EuromaxxVerified
Junkers ZC24-1MFAJunkers EuromaxxVerified

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

Guide

How to check if the ref. 8716771303 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 8716771303. If it is not visible, do not identify the part by 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 that require diagnosis in the 3-way valve 8716771303

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 only heats water or radiators, but not both at the same time.

    Cause: The motorized actuator does not rotate completely due to wear or limescale buildup.

    Check if you hear a buzzing sound when trying to change modes; if it sounds but does not move, the problem is with the turning mechanism.

  • 02

    The tap water suddenly changes from cold to very hot, without any transition.

    Cause: The valve does not regulate the flow between circuits and changes abruptly.

    Test several faucets in the house; if it happens in all of them, it is more likely to be the gas valve and not the installation of a specific faucet.

  • 03

    The actuator stops halfway and the boiler does not select the mode correctly.

    Cause: The motor is losing power or the internal gear is damaged and does not reach the end of its travel.

    If you can see the actuator, check if it reaches the end of its travel or stops before that.

  • 04

    There is a visible water leak at the valve, more noticeable when the boiler is in operation.

    Cause: The gaskets wear out with the pressure cycles when switching between heating and domestic hot water.

    Check if the dripping occurs right when you switch modes; if so, it is more likely that the problem is the gas valve and not a loose fitting.

Junkers fault codes that require diagnosis

CodeFaultTechnical checks
AAExcessive temperature difference between the heating flow circuit and the domestic hot water.If the 3-way valve does not close or closes insufficiently towards heating during a DHW demand (stuck or with poor contact in the motor connector), the DHW NTC does not rise while the flow NTC does, generating a high ΔT. Check in service mode that the valve switches to DHW, inspect the white motor connector, and ensure the cartridge is not seized.

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 8716771303 three-way valve.

Catalogue reference
8716771303
Uniclima internal SKU
V3VMEZWC28
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
Frequently asked questions

Frequently asked questions about the 3-way valve 8716771303

Does this valve Ref. 8716771303 fit the Euromaxx ZWC 24-1 MFK?
Yes, ZWC 24-1 MFK is on the list of compatible boilers for this gas valve.
When should the 3-way valve of the Euromaxx ZC 24-1 MFA be replaced?
The technical diagnosis must confirm that it is necessary to replace it, even when it becomes stuck or does not switch properly between heating and domestic hot water.
What is the function of this valve in the Euromaxx ZWC 24-1/3 MFA?
It is a three-way valve with a motorized actuator that directs water between heating and domestic hot water.

Spare parts related to Junkers Junkers Euromaxx

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Junkers 3-Way Valve Motor Euromaxx ZWC 28 1MFK 23 Ref. 8716771303