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.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8716771303
Three-way valve with reference 8716771303. Eight confirmed compatibilities: ZWC28-1MF2A and ZWC28-1MFA.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWC28-1MF2A | Junkers Euromaxx | Contrasted |
| Junkers ZWC28-1MFA | Junkers Euromaxx | Contrasted |
| Junkers ZWC28-1MFK | Junkers Euromaxx | Contrasted |
| Junkers ZWC24-1MF2A | Junkers Euromaxx | Contrasted |
| Junkers ZWC24-1MFA | Junkers Euromaxx | Contrasted |
| Junkers ZWC24-1MFK | Junkers Euromaxx | Contrasted |
| Junkers ZC28-1MFA | Junkers Euromaxx | Contrasted |
| Junkers ZC24-1MFA | Junkers Euromaxx | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if the ref. 8716771303 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.
- 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.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the 3-way valve 8716771303 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 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.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| AA | Excessive 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.
Data sheet for the Junkers 8716771303 three-way valve.
- Catalogue reference
- 8716771303
- 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 about the 3-way valve 8716771303
Does this valve Ref. 8716771303 fit the Euromaxx ZWC 24-1 MFK?
When should the 3-way valve of the Euromaxx ZC 24-1 MFA be replaced?
What is the function of this valve in the Euromaxx ZWC 24-1/3 MFA?
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