Saunier Duval 3-Way Valve Themafast F 24 E Ref. S1020900
RefurbishedSaunier Duval3-way valves

Saunier Duval 3-Way Valve Themafast F 24 E Ref. S1020900

80 €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 does not heat radiators, or vice versa. Compatible with Themafast C 24 E, Themafast C 24 E NOX, Themafast C 28 E (ref. S1020900). 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
S1020900
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. S1020900) equips these models. Verified compatibility; check the reference before purchasing.

Themafast

  • Themafast C 24 E
  • Themafast C 24 E NOx
  • Themafast C 28 E
  • Themafast F 24 E
  • Themafast F 24 E NOx
  • Themafast F 30 E

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)
F14Overtemperature in heating flow (>95 °C) – limiter triggered.If the 3-way valve gets stuck in the heating position during a DHW demand, it does not switch the flow to the heat exchanger, and the supply heats up very quickly causing F14; check that the V3V actuator moves and has power, force its travel/remove the actuator to verify passage and confirm that it switches.
How do I know if this 3-way valve is for my boiler?
Verify the reference S1020900 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.
What is it used for?
The 3-way valve diverts the water between the heating circuit and the domestic hot water (DHW) circuit.
Does it provide hot water but not heat the radiators (or vice versa)?
Typical symptom that the valve or its motor is not switching; check the actuator motor and ensure the body is not seized.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations
Check if you need the motor, the body, or the complete assembly.
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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