3-Way Valve Motor Saunier Duval Isofast C 35 EA Ref. S1025500

Saunier Duval boilers compatible with reference S1025500

3-way valve with reference S1025500. 18 verified compatibilities: F 35 E-A and F 30 E-A.

Verified 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. S1025500 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference S1025500. 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 that require diagnosis in the 3-way valve S1025500

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

  After the summer, the heating does not start even though the hot water from the tap works well.

  Cause: The plastic body has been stationary in the same position for months, and the internal mechanism is seizing up.

  Force several heating and domestic hot water cycles in succession before replacing it: sometimes it releases itself after the first use of autumn.

• 02

  The tap water temperature changes suddenly, without any apparent reason.

  Cause: The internal shutter does not fully close one passage and allows water to flow from both circuits at the same time.

  Check if there is a thermostatic or mixing faucet nearby that could be causing the same symptom before inspecting the gas valve.

• 03

  There is a water leak right at the plastic body of the valve, not at the connections.

  Cause: The material of the body, over the years and heat cycles, can lose its tightness either in itself or in its internal joints.

  Differentiate if the leak comes from the body or from a connection fitting, and tighten the latter before replacing the part.

Fault codes Saunier Duval that require diagnosis

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 3-way valve S1025500.

Catalogue reference

S1025500

Uniclima internal SKU

V3VIC35EA

Brand

Saunier Duval

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

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Body material

PA66 (polyamide 66), according to the recycling symbol molded on the part

Additional marking

Code 'UN20014407' molded on the body; due to its format, it is interpreted as a mold or batch marking, not as a commercial reference.

Manuals and technical documentation

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

• Saunier Duval F 35 E H-MOD Manual (PDF) Document © Saunier Duval, provided as a technical reference.