3-Way Valve For Thema Condens F AS24 And Others - Ref. S10791
When you open the hot water tap or turn on the heating, the 3-way valve for Thema Condens F AS24 and others is responsible for directing the water between the heating circuit and the domestic hot water circuit. If this valve fails, you may notice that you have hot water but no heating, or vice versa, or that both circuits are mixing. If fault codes F.318, F.326, or V3V blocked appear, it is a sign that the valve is not functioning properly. This part is compatible with models such as Thema Condens F24 and F25, among others. It is recommended to replace it when it shows faults or does not perform its function properly.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S10791
3-way valve with reference S10791. Two confirmed compatibilities: Thema Condens F24 and Thema Condens F25.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thema Condens F24 | Thema Condens | Contrasted |
| Saunier Duval Thema Condens F25 | Thema Condens | 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 ref. S10791 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 S10791. If it is not visible, do not identify the part from 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 S10791 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
When opening the hot water tap, the radiators suddenly cool down and do not heat up again until the boiler is turned off and on.
Cause: The shutter gets stuck in the domestic hot water position due to wear or internal dirt.
With the boiler cold, try to manually move the shaft of the gas valve motor to see if it turns freely.
- 02
You notice that it heats both circuits at the same time, with water noise in the heating even though you only requested domestic hot water.
Cause: The internal gasket is worn and allows water to pass between the two circuits.
Close the heating shut-off valves with the tap open: if the water flow does not stop, the internal leak is confirmed in the gas valve.
- 03
A clicking sound is heard when opening the tap, but it takes much longer than usual for hot water to come out.
Cause: The motor has a worn gear and switches slowly, delaying the circuit change.
Time how long it takes for hot water to come out compared to another faucet in the house; a clear delay points to the valve motor.
- 04
The motor hums but does not move from its position.
Cause: The shaft has seized, something common after the boiler has been idle during the summer.
Disconnect the motor and manually check if the shaft rotates normally before declaring the part as broken.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.318 | The 3-way motorised valve is not moving. | The servomotor/head of the V3V is disconnected, faulty, or seized; check voltage and connection at the connector and perform the service test that moves the V3V (e.g., P.008). |
| F.326 | The hydraulic test detects several components not functioning; V3V blocked. | The shutter/motor of the V3V is stuck and does not switch during the test; mechanically check the travel and electrically check the servomotor to see if it changes position in the service test. |
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 Saunier Duval S10791 three-way valve.
- Catalogue reference
- S10791
- Brand
- Saunier Duval
- Type of part
- 3-way valves
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thema Condens F25 Manual (PDF)Document © Saunier Duval, provided as a technical reference.
