3-Way Valve Saunier Duval ThemaClassic F24E Ref. S1020800
The Saunier Duval ThemaClassic F24E three-way valve, with reference S1020800, is responsible for directing water between the heating circuit and the domestic hot water circuit. If it malfunctions, you will notice that there is hot water but no heating, or vice versa, and there may even be a mixing of both circuits. This component is compatible with several models from the ThemaClassic and Thematek ranges, among others, such as the ThemaClassic F 24 E and the Thematek F 24 E. It is advisable to replace it when you experience these operational issues.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S1020800
3-way valve with reference S1020800. 16 verified compatibilities: ThemaClassic F 24 E and ThemaClassic C 24 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval ThemaClassic F 24 E | ThemaClassic | Contrasted |
| Saunier Duval ThemaClassic C 24 E | ThemaClassic | Contrasted |
| Saunier Duval ThemaClassic C 24 EV | ThemaClassic | Contrasted |
| Saunier Duval ThemaClassic F 25 E | ThemaClassic | Contrasted |
| Saunier Duval ThemaClassic C 25 E | ThemaClassic | Contrasted |
| Saunier Duval ThemaClassic C 25 EV | ThemaClassic | Contrasted |
| Saunier Duval Thematek F 24 E | Thematek | Contrasted |
| Saunier Duval Thematek C 24 E | Thematek | Contrasted |
| Saunier Duval Thematek C 24 EV | Thematek | Contrasted |
| Saunier Duval Thematek C 18 E | Thematek | Contrasted |
| Saunier Duval Thematek C 18 EV | Thematek | Contrasted |
| Saunier Duval Thematek S F 24 E | Thematek | Contrasted |
| Saunier Duval Thematek S C 24 E | Thematek | Contrasted |
| Saunier Duval Thema F 24 E | Thema | Contrasted |
| Saunier Duval Thema C 24 E | Thema | Contrasted |
| Saunier Duval Thema C 24 EV | Thema | 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. S1020800 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 S1020800. 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 S1020800 three-way valve 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 tap water comes out cold while the radiators heat up or vice versa.
Cause: The valve does not switch circuits and does not direct the water correctly.
Check if the open tap generates enough flow rate for the flow sensor to detect the demand before inspecting the gas valve.
- 02
The boiler does not respond to the change: it remains in the same circuit even when the demand is changed.
Cause: The internal mechanism that diverts the water is stuck and does not complete the full movement.
Bleed the heating circuit and make sure there is no air or dirt before considering that the gas valve is damaged.
- 03
There is a puddle of water or constant dripping where the 3-way valve is installed.
Cause: The seals or the shaft of the gas valve have lost tightness due to use and oxidation.
Dry the area well, turn on the boiler, and locate the exact point of the leak before replacing the part.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F14 | Heating temperature > 95 °C (temperature limiter). | If the 3-way valve (S1020800) gets stuck or does not switch, the boiler remains in the heating circuit during DHW demand, causing overheating and F14; verify by forcing DHW/heating demand and checking that the actuator moves the spindle and that the 3-way valve is not seized/calcified. |
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 S1020800 three-way valve.
- Catalogue reference
- S1020800
- 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
Frequently asked questions about the 3-way valve S1020800
Is this Saunier Duval ThemaClassic F24E 3-way valve Ref. RV3V T-F24E compatible with my boiler?
Which models are compatible with the 3-way valve RV3V T-F24E?
What fault codes are documented for this gas valve?
Can I use this valve in boilers from the Thematek range?
Is the 3-way valve RV3V T-F24E suitable for the ThemaClassic C 24 E?
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