3-Way Valve Motor Saunier Duval 3 Themafast C 30 E Ref. S1025500
RefurbishedSaunier Duval3-way valves

3-Way Valve Motor Saunier Duval 3 Themafast C 30 E Ref. S1025500

60 €VAT includedIn stock · 1 unit

3-way valve: refurbished spare part that diverts water between heating and domestic hot water. Useful if it provides hot water but doesn't heat radiators, or vice versa. Compatible with F 35 E-A, F 30 E-A, C 35 E-A (ref. S1025500). Includes a one-year warranty and delivery within 2–4 working days in the EU.

1
Consult via WhatsApp
Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
S1025500
Brand
Saunier Duval
Type of part
3-way valves
Available units
1 unit in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. S1025500) equips these models. Verified compatibility; check the reference before purchasing.

Isofast

  • F 35 E-A
  • F 30 E-A
  • C 35 E-A
  • F 35 E H-MOD
  • F 30 E H-MOD
  • Condens F 30 E
  • Condens F 35 E

Isomax

  • F 35 E
  • F 35 H-MOD
  • Condens F 35 E

Isotwin

  • F 30 H-MOD
  • Condens F 30 E

Themafast

  • F 25 E
  • F 30 E
  • C 25 E
  • C 30 E
  • Condens F 25
  • Condens F 30

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

CodeWhat does it mean?Cause and diagnosis (this part)
F.20Safety shutdown: temperature limiter.If the 3-way valve (priority valve) is blocked or disconnected, the primary flow does not switch correctly and the generator overheats, triggering the F.20; to verify, force the test/diagnosis that moves the valve from the service menu and check the power supply/wiring and ensure the shaft/motor are not seized.
How do I know if this is the gas valve for my boiler?
Verify the reference S1025500 and ensure your model is on the list of compatibles; compare the body, the actuator motor, and the connections with the original. It is a Saunier Duval / DIFF part.
What is the purpose of the 3-way valve?
It diverts the water between the heating circuit and the domestic hot water (DHW) circuit. When you open a hot water tap, it switches to prioritise DHW and stops sending water to the radiators.
The boiler provides hot water but does not heat the radiators (or vice versa), is it the valve?
It is a typical symptom: the valve or its motor do not switch. It is also common for the radiators to heat up when the DHW tap is opened. Check the actuator motor and ensure the body is not seized or calcified.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo and we will confirm it.
Is it the motor, the body, or the assembly?
Check if you need just the actuator motor, only the body, or the complete assembly; compare it with your original part before installing. This is Saunier Duval / DIFF.
What does refurbished mean and what coverage does it have?
Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

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