Vaillant VMW 24/282-5 R1 transformer
The Vaillant VMW 24/282-5 R1 transformer is a device that generates the spark needed to ignite the burner of the boiler. When this part fails, the boiler cannot start, resulting in failed ignition attempts, which can lead to fault codes F.28 or F.29. This transformer is compatible with models from the Turbo Tec, Atmo Tec, and VC ranges of Vaillant, among others. It needs to be replaced when the boiler has starting issues or extinguishes the flame during operation.
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 respond to anything, neither to the remote control nor to the buttons on the panel.
Cause: There is no power in the secondary, so the control board does not receive power to start up.
Measure the voltage at the secondary faston with the multimeter before replacing the part; if there is no reading, the transformer may be damaged.
- 02
The protective fuse blows repeatedly shortly after being replaced.
Cause: A short circuit in a component connected to the secondary (fan, gas valve, relay) is drawing more current than it should.
Disconnect the components of the secondary one by one and check if the fuse holds before blaming the transformer.
- 03
There is a strange buzzing noise in the electrical panel, louder than usual.
Cause: The core may be saturated or the winding may have a partial short circuit, causing vibrations and heating.
Turn off the power and touch the transformer; if it is hot or smells burnt, it is an indication of a fault.
- 04
The boiler has been experiencing intermittent electronic faults that do not always occur in the same way.
Cause: An unstable voltage in the secondary due to a damaged winding causes inconsistent faults.
Note the conditions under which the fault occurs (cold, hot, many hours of use) and measure the secondary voltage at those times if you can reproduce it.
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
- Secondary voltage
- 17 V
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
Is this transformer suitable for the Vaillant VMW 24/282-5 R1?
Which models are compatible with the Vaillant transformer TCVR1?
What voltages does the Vaillant transformer TCVR1 have?
What fault codes are documented for this transformer?
Is this transformer suitable for Vaillant heating boilers?
Spare parts related to Vaillant Turbo Tec / Turbo Pro (VMW)
