Saunier Duval Themis 223 ME Electronic Ignition Box Ref. 51704
RefurbishedSaunier DuvalTransformers

Saunier Duval Themis 223 ME Electronic Ignition Box Ref. 51704

Stock · 7 units

If your Saunier Duval Themis 223 ME boiler is making starting attempts without being able to ignite the flame, you may need a new Electronic Ignition Box. This part is an ignition transformer that generates the spark necessary to ignite the burner. When it fails, the boiler locks out after several unsuccessful attempts. It is compatible with other models in the Saunier Duval range, such as the Themis 625 ME, among others. It is recommended to replace it when these symptoms occur to restore the boiler's operation.

VAT included

Compatibility

Saunier Duval boilers compatible with reference 51704

Ignition transformer with reference 51704. Two confirmed compatibilities: Themis 223 ME and Themis 625 ME.

Proven compatibility

Boiler modelFamilyVerification
Saunier Duval Themis 223 MESaunier DuvalContrasted
Saunier Duval Themis 625 MESaunier DuvalContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if the part number 51704 is the one for your boiler.

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 51704. 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.
Diagnosis and fault codes

Symptoms and faults that the ignition transformer 51704 resolves.

The ignition transformer generates the high voltage for the spark of the electrodes. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The boiler does not ignite: the gas opens but there is no flame.

    Cause: The transformer does not provide the necessary voltage for the electrode to generate a spark, and the burner does not ignite.

    Check the condition of the electrode and the high voltage cable before assuming that the transformer is faulty.

  • 02

    The boiler becomes locked after several failed ignition attempts.

    Cause: The control board detects that there is no flame and cuts off the gas supply for safety.

    Note the fault code that appears on the display; it will help you confirm if the issue is with the ignition.

  • 03

    The burner takes longer to ignite each time or fails more when the boiler is cold.

    Cause: The winding gradually loses efficiency before completely stopping functioning.

    Compare how the boiler behaves when cold and hot to identify the fault pattern.

  • 04

    A strange electrical clicking sound is heard near the burner when trying to ignite.

    Cause: There may be a high voltage arc outside the electrode, caused by a leak in the transformer or in the wiring.

    Visually inspect the transformer and the connections for signs of moisture, dirt, or burns.

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.

Technical data

Ignition transformer data sheet Saunier Duval 51704

Catalogue reference
51704
Brand
Saunier Duval
Type of part
Transformers
Units in stock
7 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

Voltage
220/240 V
Frequency
50-60 Hz
Maximum temperature
125 °C
Frequently Asked Questions

Frequently asked questions about the ignition transformer 51704

Does this transformer Ref. 51704 work for the Saunier Duval Themis 223 ME?
Yes, the Themis 223 ME is one of the two models indicated as compatible.
What voltage and temperature does the transformer of the Themis 223 ME operate at?
According to the label, it operates at 220/240 V and 50-60 Hz, with a maximum service temperature of 125°C.
Is this transformer Ref. 51704 also suitable for the Saunier Duval Themis 625 ME?
Yes, the Themis 625 ME is on the list of compatible boilers along with the Themis 223 ME.
What is the reference for this transformer?
The reference for this transformer is TET223.
How many models are compatible with this transformer?
This transformer is compatible with a total of 2 models.
Are there documented fault codes for this product?
No, there are no documented fault codes for this product.

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Saunier Duval Themis 223 ME Electronic Ignition Box Ref. 51704