Transformer Ref. 287450 For Boiler VCM 242 E (and Other Compatible Models)

Vaillant boilers compatible with reference 287450

Ignition transformer with reference 287450. 12 verified compatibilities: VMW ES 242/3 and VMW 242-3.

Proven compatibility

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

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. 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.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. 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 287450

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

  Sometimes it ignites well, and other times it needs two or three attempts to start.

  Cause: A worn transformer produces an irregular arc, sufficient at times and not at others.

  Check if the fault occurs more with the cold boiler or after some time in operation; if it worsens when heated, it could be a thermal issue with the transformer.

• 02

  The boiler locks out showing an ignition fault, but the electrode does not generate a spark.

  Cause: Without the proper voltage at the electrode, the gas does not ignite, and that voltage is provided by the transformer.

  Before replacing it, check that the ignition cable is not cracked or loose and that the electrode has the correct spacing.

• 03

  A failure to ignite warning appears every time it tries to start.

  Cause: The control board does not detect the flame ionization because it does not receive the high voltage pulse that should be generated by the transformer.

  Note the exact code displayed; in many models, the same warning can indicate a dirty electrode, a damaged cable, or a problem with the transformer, so it is advisable to rule out the other two first.

• 04

  It has difficulty starting, making several attempts in a row before igniting, whereas before it would do so on the first try.

  Cause: A poor ground connection at the electrode or transformer weakens the arc and delays ignition.

  Check the continuity of the boiler's earth and the ground wire of the electrode before blaming the transformer.

Vaillant fault codes that require diagnosis

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

Uniclima internal SKU

TETVCM242

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

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

code engraved on the part

287450

frequency

50/60Hz

insulation class

1z70/B