Transformer ES746033 For Saunier Duval Boiler SDHV 19
ES746033 transformer for Saunier Duval SDHV 19 boiler. This part is an ignition transformer that generates the spark needed to ignite the burner. If it fails, you will notice that the boiler tries to start but cannot ignite the flame, which can lead to a potential lockout. This transformer is compatible with the Saunier Duval SDHV 19 boiler, among others. A technician must confirm through diagnosis whether it needs to be replaced when the mentioned symptoms occur or when the boiler does not start correctly.
- Type of part
- Transformers
- Status
- Refurbished
- internal SKU
- TBCSDHV19
- Warranty
- 1 year
Compatible Saunier Duval boilers
Ignition transformer. A proven compatibility: Duval SDHV 19.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Duval SDHV 19 | Saunier | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference —. If it is not visible, do not identify the part by its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms that require diagnosis in the ignition transformer
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 tries to ignite, but the burner does not light.
Cause: The transformer does not provide the high voltage necessary for a spark to jump at the electrode.
Check the electrode and the high voltage cable before assuming that the transformer is the problem.
- 02
The boiler locks out with an ignition fault after several attempts.
Cause: The control unit cuts off the gas for safety reasons when it does not detect a flame after several attempts.
Unlock the boiler and repeat the cycle, paying attention to whether the fault occurs at the same step each time.
- 03
The ignition fails more when the boiler is cold and improves when it is running.
Cause: A winding that degrades performs worse in cold conditions before completely failing.
Note under what conditions it fails (cold or hot) and check the transformer connections before replacing it.
- 04
Do you notice a crackling or strange arc near the burner when trying to ignite?
Cause: A high voltage leak due to damaged insulation of the transformer generates arcs outside the electrode.
Visually inspect the transformer and wiring for cracks, moisture, or burn marks.
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.
Saunier Duval ignition transformer datasheet
- Uniclima internal SKU
- TBCSDHV19
- Brand
- Saunier Duval
- Type of part
- Transformers
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- part code
- ES746033 (alternative reading registered: ES745033)
- variant code
- 0A19 M
Frequently asked questions about the ignition transformer
What is the physical appearance of the SDHV 19 transformer?
