Transformer For Baxi Roca Victoria 24/24 F

Baxi Roca boilers compatible with reference 77121156

Ignition transformer with reference 77121156. Four confirmed compatibilities: Victoria 24/24 F GN and Victoria 24/24 F GP.

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. 77121156 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 77121156. 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 77121156

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 tries to ignite, the gas valve can be heard opening, but there is no flame and it locks out with an ignition fault.

  Cause: The transformer does not generate the high voltage arc necessary to ignite the gas, so the control board shuts off for safety.

  With the burner in view, check if there is a spark at the electrode when trying to ignite; if there is no spark, check that the ignition cable is properly connected and free of cracks.

• 02

  Sometimes it lights up without any problem, and other times you have to press the reset several times until it ignites.

  Cause: A damaged winding inside the transformer produces an irregular arc, weaker in some attempts than in others.

  Check if the fault occurs more frequently when the boiler has been on for a while and has heated up; if it worsens when hot, it points to a thermal issue with the transformer.

• 03

  When trying to ignite, a slight burnt smell is noticeable near the burner.

  Cause: A transformer with damaged winding can overheat and emit a smell of burnt plastic or resin.

  Before replacing it, check the epoxy resin of the transformer for any cracks, darkened areas, or scorch marks.

• 04

  The boiler display shows a fault code for ignition or flame, and the unit does not start.

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

  Note the exact code and consult the manual: the same code may be due to a dirty or improperly placed electrode, it is advisable to rule it out before changing the transformer.

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.

Data sheet for the Baxi Roca ignition transformer 77121156

Catalogue reference

77121156

Uniclima internal SKU

TERV2424F

Brand

Baxi Roca

Type of part

Transformers

Units in stock

2 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.

voltage

220-230V

frequency

50Hz