3-Way Valve Saunier Duval ThemaClassic F25E Ref. S1020800

Saunier 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

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.

1. 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.
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.

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

  There is no hot water coming from the tap even though the heating is working fine, or vice versa.

  Cause: The valve does not change position correctly and leaves a circuit non-functional.

  Check that the flow meter detects the consumption when the tap is opened before changing the gas valve.

• 02

  The boiler does not switch circuits when it should: it stays in heating or in domestic hot water.

  Cause: The internal switching mechanism is stuck due to dirt or wear.

  Check for trapped air in the system by bleeding the radiators and the circuit before inspecting the gas valve.

• 03

  Do you see water dripping or a damp ring around the body of the gas valve?

  Cause: The internal seals have lost their sealing capacity and allow water to leak out.

  Dry the area and turn on the boiler to confirm that the dripping is indeed coming from the gas valve, not from a nearby fitting.

Fault codes from Saunier Duval that this spare part resolves.

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

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Saunier Duval Themaclassic F 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.