Ignition Transformer Vaillant Turbomax PRO VMW/VUW 242
The ignition transformer Vaillant Turbomax PRO VMW/VUW 242, reference 287450, is a component that generates the spark necessary to ignite the burner of the boiler. If this part fails, you will notice that the boiler attempts to start unsuccessfully, which can lead to fault codes F.28 and F.29. This transformer is compatible with several models from the Vaillant Turbo Tec, Vaillant Atmo Tec, and Vaillant VC ranges, among others. Replacement is recommended when the mentioned symptoms occur or when the boiler does not ignite properly.
VAT included
Consult via WhatsAppVaillant boilers compatible with reference 287450
Ignition transformer with reference 287450. 12 verified compatibilities: VMW ES 242/3 and VMW 242-3.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Vaillant VMW ES 242/3 | Vaillant Turbo Tec / Turbo Pro (VMW) | Contrasted |
| Vaillant VMW 242-3 | Vaillant Turbo Tec / Turbo Pro (VMW) | Contrasted |
| Vaillant VMW 242-5 | Vaillant Turbo Tec / Turbo Pro (VMW) | Contrasted |
| Vaillant VMW 240-5 | Vaillant Turbo Tec / Turbo Pro (VMW) | Contrasted |
| Vaillant VMW 282-5 | Vaillant Turbo Tec / Turbo Pro (VMW) | Contrasted |
| Vaillant VM 242-5 | Vaillant Atmo Tec / VM (heating only) | Contrasted |
| Vaillant VM 282-5 | Vaillant Atmo Tec / VM (heating only) | Contrasted |
| Vaillant VC 242 E | Vaillant VC / VCM (combi-compact) | Contrasted |
| Vaillant VCM 242 E | Vaillant VC / VCM (combi-compact) | Contrasted |
| Vaillant VCM 282 E | Vaillant VC / VCM (combi-compact) | Contrasted |
| Vaillant VMI 280-7 | Vaillant VMI | Contrasted |
| Vaillant VMI 282-7 | Vaillant VMI | 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. 287450 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 287450. 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 287450 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 on any attempt.
Cause: If the transformer does not deliver the current that the ignition system needs, it cannot generate the spark.
Check that the boiler fuse is not blown and that power is reaching the transformer before replacing it.
- 02
The ignition intermittently fails, sometimes it lights and other times it doesn't.
Cause: An unstable power output from the transformer causes irregular ignition.
Record if the fault always occurs at the same point in the start-up cycle, it helps to differentiate the electrode transformer.
- 03
The boiler locks out after several ignition attempts without achieving a flame.
Cause: Without stable power to the ignition system, the control board exhausts the retries and locks out for safety.
Check the lock code on the display; if it indicates a flame fault and not a flue pressure switch fault, point to the ignition circuit.
- 04
There is no arc or noticeable sparking at the electrode during the ignition attempt.
Cause: No output current from the transformer means insufficient energy reaches the electrode to produce the arc.
With the boiler in ignition test mode, check if there is a visible spark at the electrode before declaring the transformer faulty.
Fault codes from Vaillant that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.28 | Fault during start-up: the boiler fails to ignite the burner in the start-up phase. | The ignition transformer is part of the ignition system (transformer + cable + electrode); if the transformer fails, it does not generate the high voltage for the spark, and the boiler aborts the start-up without detecting a flame. Verify: measure the transformer's output voltage to the electrode and check for a spark at each start-up; if there is no spark and the wiring/electrode are fine, the transformer is the cause. |
| F.29 | The flame goes out during operation and re-ignition attempts fail. | The Vaillant service documentation explicitly lists "the ignition transformer has a spark fault" as the cause of F.29: if the transformer does not reignite after a flame failure, the lockout is triggered. Verify: check the spark generation of the transformer during ignition retries and rule out poor grounding, gas pressure, and condensate pipe before. |
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 287450 ignition transformer datasheet
- Catalogue reference
- 287450
- Brand
- Vaillant
- Type of part
- Transformers
- Units in stock
- 1 unit
- 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.
- Primary voltage
- 230 V
- Frequency
- 50/60 Hz
- Secondary voltage
- 17 V
- Apparent power
- 18.4 VA
- Fuse
- 1.25 AT
- Core
- EI60
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Vaillant VMW 242-5 Manual (PDF)Document © Vaillant, provided as a technical reference.
Frequently asked questions about the ignition transformer 287450
What fault indicates that the ignition transformer needs to be replaced in the Vaillant Turbomax PRO VMW 242?
Is this transformer compatible with the Vaillant VUI 282-7 R3 boiler?
What type of core does the ignition transformer Vaillant TTES242 have?
What is the maximum current that the fuse of this transformer can support?
How many models are compatible with the ignition transformer Vaillant TTES242?
What are the documented fault codes for this transformer?
Spare parts related to Vaillant Turbo Tec / Turbo Pro (VMW)
