3-Way Valve With Motor, no. 591958, Themaclassic/Thematek S 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

  When requesting hot water, the heating stops heating (or vice versa).

  Cause: The three-way valve does not change position and leaves the incorrect circuit open.

  Check on the remote that the boiler is in the correct mode and that it is not a programming fault before inspecting the gas valve.

• 02

  The motorized valve makes noise but the boiler does not switch circuits.

  Cause: The motor spins but the internal shaft is broken or uncoupled, so it does not move the shutter.

  If you hear the motor running and it still doesn't change the service, it is a sign that the internal coupling has failed and not just the motor.

• 03

  The valve gets stuck, and the boiler shows a fault or shuts down.

  Cause: The waste or limescale has blocked the internal mechanism, and the motor cannot move it even if it tries.

  Before replacing it, check if there is a lot of limescale in the circuit: a new valve can get blocked again if the water remains hard.

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

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

Number embedded in the part

591958

Manuals and technical documentation

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

• Saunier Duval Thematek C 24 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.