Ignition Transformer Vaillant Thermocompact VCW 240 XE Ref. 091235
When you turn on the hot water tap or activate the heating, the Vaillant Thermocompact VCW 240 XE Ignition Transformer is responsible for generating the spark that ignites the burner. If this part fails, you will notice that the boiler attempts to start unsuccessfully, which may lead to the fault code F.29: Ignition failure. This part is compatible with several models from the Thermocompact and Combicompact ranges, such as the VCW 240 XE and others. It should be replaced when the boiler shows ignition problems or locks out after several attempts.
VAT included
Consult via WhatsAppVaillant boilers compatible with reference 091235
Ignition transformer with reference 091235. Ten verified compatibilities: VC 180 XE and VC 182 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Vaillant VC 180 XE | Thermocompact / Combicompact VC (heating only) | Contrasted |
| Vaillant VC 182 E | Thermocompact / Combicompact VC (heating only) | Contrasted |
| Vaillant VC 240 XE | Thermocompact / Combicompact VC (heating only) | Contrasted |
| Vaillant VC 280 XE | Thermocompact / Combicompact VC (heating only) | Contrasted |
| Vaillant VCW 180 XE | Thermocompact / Combicompact VCW (combi) | Contrasted |
| Vaillant VCW 182 E | Thermocompact / Combicompact VCW (combi) | Contrasted |
| Vaillant VCW 240 XE | Thermocompact / Combicompact VCW (combi) | Contrasted |
| Vaillant VCW 242 E | Thermocompact / Combicompact VCW (combi) | Contrasted |
| Vaillant VCW 280 XE | Thermocompact / Combicompact VCW (combi) | Contrasted |
| Vaillant VCW Vent 240 E | Thermocompact / Combicompact VCW (combi) | 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 ref. 091235 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 091235. If it is not visible, do not identify the part from 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 and faults that the ignition transformer 091235 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 burner and needs to be reset to try again.
Cause: The transformer does not generate the necessary spark, so the control unit does not validate the flame and blocks the cycle.
Try resetting and see if it starts on the first attempt; if the fault is intermittent, rule out a bad connection in the transformer connector.
- 02
The ignition fault occurs more often when it's cold than when the boiler has been running for a while.
Cause: A damaged transformer can fail when cold and recover when it heats up.
Compare if the fault always occurs on the first start of the day; that pattern indicates that the problem may be with the transformer.
- 03
You can hear the ignition sparking, but the flame does not stabilize.
Cause: The voltage is insufficient or irregular to maintain the arc for the necessary time.
Check that the electrode is properly aligned and free of rust, as a faulty electrode can cause the same symptom without the transformer failing.
- 04
The boiler repeatedly locks out and needs to be reset frequently.
Cause: The ignition attempts without a spark exhaust the margin provided by the control board before it locks out for safety.
Check the boiler's fault history to see if the lock always indicates a flame failure, to avoid replacing a part that is not the cause.
Fault codes from Vaillant that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.29 | Ignition fault / the flame goes out during operation and re-ignition attempts are unsuccessful. | The ignition transformer is the component that generates the high voltage for the spark; if it is faulty, a stable spark is not produced and the boiler fails to ignite, triggering F.29. Check: ensure that the spark reaches the electrode (no spark with correct gas and grounding points to the transformer/ignition cable); measure the continuity of the transformer and replace if it does not generate the spark. |
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.
Vaillant 091235 ignition transformer datasheet
- Catalogue reference
- 091235
- Brand
- Vaillant
- Type of part
- Transformers
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions about the ignition transformer 091235
Is this ignition transformer suitable for the Vaillant VCW 180 K XE?
How do I check if my Vaillant VC 244 XE needs this ignition transformer?
What is the function of the ignition transformer in the Vaillant VC 245 E?
Spare parts related to Vaillant Thermocompact / Combicompact VCW (combi)
