Ignition Transformer ERA Ref. 8747201252 For Junkers Euromaxx ZWC24-1MFA23 (and Other Compatible Junkers/Bosch Models)
Ignition transformer manufactured by ERA, installed as a spare part in boilers marketed by Junkers/Bosch. Reference engraved on the part: 8747201252, confirmed by two independent sources in addition to the label. According to the silkscreen printing, it operates at 230 V on the primary side (50/60 Hz) with an output of 25 V 34 VA on the main secondary. The replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler does not ignite due to lack of spark at the electrode.
- Type of part
- Transformers
- Status
- Refurbished
- Catalogue reference
- 8747201358
- Warranty
- 1 year
Junkers boilers compatible with reference 8747201358
Ignition transformer with reference 8747201358. Six confirmed compatibilities: ZWC24/28-1MFA23 and ZWC24/28-1MFA31.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWC24/28-1MFA23 | Euromaxx ZWC | Contrasted |
| Junkers ZWC24/28-1MFA31 | Euromaxx ZWC | Contrasted |
| Junkers ZWC28/32-1MFA23 | Euromaxx ZWC | Contrasted |
| Junkers ZWC28/32-1MFA31 | Euromaxx ZWC | Contrasted |
| Junkers ZWC28-1MFA23 | Euromaxx ZWC | Contrasted |
| Junkers ZWC28-1MFK23 | Euromaxx ZWC | 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. 8747201358 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 8747201358. 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 that require diagnosis in the ignition transformer 8747201358
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, although it is noticeable that the control board is making an attempt.
Cause: The transformer does not generate enough voltage for the spark to jump at the electrode.
Check that the transformer connector is properly fitted and free of signs of moisture or rust before replacing it.
- 02
The boiler takes several attempts to ignite, sometimes two or three starts before it lights up.
Cause: An unstable voltage output from the transformer causes the spark to be weak in some attempts and sufficient in others.
Check the electrode tip: if it is worn or the gap is open, it can produce the same symptom even if the transformer is not faulty.
- 03
There is no visible spark at the electrode, although the boiler can be heard trying to ignite.
Cause: The primary of the transformer can receive power, but the secondary does not deliver the high output voltage.
With a multimeter, measure if 230V is reaching the primary; if it does and there is still no spark, the transformer is clearly suspect.
- 04
The boiler locks out due to an ignition fault and needs to be reset to try again.
Cause: If no spark or flame is detected within the safety time, the control board cuts off the gas and locks the unit.
Check if the blockage occurs always on the first attempt or only sometimes, as this helps to distinguish between a completely faulty transformer and one that fails intermittently.
Junkers fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| F7 | The boiler does not ignite properly. | The ionization signal is incorrect, which may be due to a dirty or faulty ignition transformer. If the boiler is having trouble igniting, check the transformer, as it could be the cause of the fault. |
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.
Ignition transformer datasheet Junkers 8747201358
- Catalogue reference
- 8747201358
- Uniclima internal SKU
- TJE-1MFA 23
- Brand
- Junkers
- Type of part
- Transformers
- Units in stock
- 3 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.
- Type / manufacturer code
- Typ EI 66/30 / BV 066-0213.0
- Reference engraved on the part
- 8747201252
- The actual manufacturer of the transformer is ERA; the commercial brand of the boiler (Junkers/Bosch) does not manufacture it.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Junkers ZWC24/28-1MFA23 manual (PDF) Document © Junkers, provided as a technical reference.
Frequently asked questions about the ignition transformer 8747201358
Who manufactures the ignition transformer ERA Ref. 8747201252 for the Junkers Euromaxx ZWC24-1MFA23?
Which boiler models are compatible with the transformer ERA Ref. 8747201252?
What reference is engraved on the ERA transformer?
What output voltage does this transformer provide on the main secondary?
What fault code is documented for this transformer?
What is the reference of the specific boiler model for which this transformer is used?
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