Vaillant Thermocompact VCW Vent 240 01 E Transformer - Type E3707/5 - Ref. 091235
Vaillant Thermocompact VCW Vent 240 01 E transformer - Ref. E3707/5. This part is responsible for generating the spark needed to ignite the burner of the boiler. If it fails, you will notice that the boiler attempts to start unsuccessfully and displays the fault code F.29, indicating an ignition fault. It is compatible with models such as VCW 240 XE, VCW 280 XE, and VCW Vent 240 E, among others. It should be replaced when these symptoms of ignition blockage occur.
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 complete the ignition cycle and always stops at the same point.
Cause: This transformer powers part of the ignition circuit; if it does not deliver current, that stage is not completed and the process stops.
With the boiler running, measure with the multimeter if there is current at the secondary terminals before replacing it.
- 02
The boiler behaves erratically: sometimes it ignites and other times it locks out without a clear pattern.
Cause: An unstable output current in the secondary intermittently affects the circuit it powers.
Check that the connector and the transformer wires are properly secured; a loose connection causes the same irregular behavior.
- 03
Upon disassembling the boiler, the transformer appears discolored, deformed, or smells burnt.
Cause: A transformer that has operated in short circuit or overheated degrades physically and stops delivering the correct current.
Visually inspect the casing and the winding; if there are no physical signs, first check the input current before confirming the replacement.
- 04
The boiler does not start at all and no other symptoms are visible on the display.
Cause: If the primary does not receive the indicated 220/240V as stated on the label, the transformer cannot provide output and the circuit that depends on it remains unpowered.
Check with the multimeter that there is mains voltage at the primary before considering the transformer as 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
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Type
- E3707/5
- Voltage
- 220/240 V~
- Frequency
- 50/60 Hz
- Power
- 1.7 VA
- Thermal class of the fuse
- T85
Frequently asked questions about the ignition transformer 091235
Is this transformer Type E3707/5 suitable for a Vaillant VCW 240 XE?
What power and supply does the transformer Ref. 091235 have?
Does this transformer also work for a Vaillant VC 282 E?
Spare parts related to Vaillant Thermocompact / Combicompact VCW (combi)
