Recurrent Ignition Transformer Saunier Duval Isofast C 35 E1 ZIG 2/12 Ref. S5742700
RefurbishedSaunier DuvalTransformers

Recurrent Ignition Transformer Saunier Duval Isofast C 35 E1 ZIG 2/12 Ref. S5742700

15 €VAT includedIn stock · 5 units

Ignition transformer: refurbished spare part that generates high voltage for the spark of the electrodes. Useful if there is no spark or ignition failures are repeated. Compatible with C24E, C25E, F25E (ref. S5742700). 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
S5742700
Brand
Saunier Duval
Type of part
Transformers
Available units
5 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. S5742700) equips these models. Verified compatibility; check the reference before purchasing.

ThemaClassic

  • C24E
  • C25E
  • F25E

Themafast

  • C24E
  • C25E
  • C28E
  • C30E
  • F24E
  • F25E
  • F30E

Isofast

  • C28E1
  • C35E1
  • F28E1
  • F30
  • F35E1

Opalia

  • C16E
  • F11E
  • F14E
  • F17E

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.28Ignition failure at start-up: the boiler attempts to ignite the burner and does not detect a flame after several attempts, resulting in a lockout.The ignition transformer is the component of the ignition group that generates the arc/spark; if it is faulty, the spark does not occur and the boiler does not ignite, showing F.28. Check: with the boiler in demand, verify if there is a visible/audible arc at the electrode; measure continuity/power supply of the transformer and rule out the electrode, ignition cable, and connector first (same causes listed for the ignition group).
How do I know if this ignition transformer is for my boiler?
Verify the reference S5742700 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 ignition transformer generates the high voltage for the electrode spark.
Is there no spark or repeated ignition faults?
No spark at the electrode despite having gas.
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 the electrode and the high voltage cable.
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.

Spare Parts Related Boiler Isofast C 35 E1 ZIG 2/12

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