Saunier Duval 3-Way Valve Motor Isofast C 35 EA Ref. S1053700
RefurbishedSaunier Duval3-way valves

Saunier Duval 3-Way Valve Motor Isofast C 35 EA Ref. S1053700

45 €VAT includedIn stock · 5 units

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, Themafast C 25E, Themafast C 30E (ref. S1053700). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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

Key Data

Reference
S1053700
Brand
Saunier Duval
Type of part
3-way valves
Available units
5 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. S1053700) equips these models. Verified compatibility; check the reference before purchasing.

Themafast / Themafast Condens

  • Themafast
  • Themafast C 25E
  • Themafast C 30E
  • Themafast F25E
  • Themafast F30
  • Themafast Condens F25
  • Themafast Condens F 30
  • Condens F 24E
  • Condens F 30E

Isofast / Isofast Condens

  • Isofast
  • Isofast F 30E
  • Isofast F 35E
  • Isofast 21 F25
  • Isofast 21 F30
  • Isofast 21 F35

Isotwin / Isotwin Condens

  • Isotwin C 30
  • Isotwin F 25
  • Isotwin F 30
  • Isotwin F 30A

Isomax / Isomax Condens

  • Isomax C 30
  • Isomax F 35 B
  • Isomax F 35 E
  • Isomax F 35 H

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.318The 3-way motorised valve does not move.The motor of the 3-way valve (S1053700) is blocked/faulty or its connector/harness is loose; verify by actuating the valve with the actuator test (e.g., T.002) and checking in d.35 that the position does not change, as well as reviewing the connection and continuity to the motor.
F.326The hydraulic test of sensors/actuators has detected that at least two hydraulic components are not functioning.A documented cause is the blocked/defective 3-way motorised valve (S1053700); check its operation with T.002 or P.008 and observe in d.35 if it does not change position, in addition to checking the connector and wiring harness.
How do I know if this 3-way valve is for my boiler?
Verify the reference S1053700 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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