ERA transformer Junkers Euromaxx ZWC 28 28 1MFK 23 Ref. 8747201358
If your boiler attempts to start without successfully igniting the flame, a technical diagnosis must confirm if you need the Junkers Euromaxx ZWC 28 28 1MFK 23 Ignition Transformer. This part is an ignition transformer that generates the spark necessary to ignite the burner. When it fails, the boiler may display the fault code F7, indicating that it does not correctly detect the flame. It is compatible with models from the Euromaxx ZWC range, such as the ZWC24/28-1MFA23, ZWC24/28-1MFA31, and ZWC28/32-1MFA23, among others. A technician must confirm through diagnosis whether it is necessary to replace it when this type of ignition fault occurs.
- 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 respond to any button, as if it has no power.
Cause: Without the reduced voltage provided by this transformer, the PCB does not receive power and does not start.
Measure with a multimeter if there is mains voltage at the primary of the transformer before declaring it faulty.
- 02
The display flickers, restarts by itself, or shows meaningless symbols.
Cause: An unstable low voltage output in the secondary causes resets in the control electronics.
Check if the fault coincides with knocks or vibrations in the boiler; a loose wiring in the transformer can cause similar symptoms.
- 03
The boiler turns off by itself in the middle of a heating or domestic hot water cycle.
Cause: A sudden drop in voltage on the secondary side causes the PCB to lose auxiliary power and interrupt the cycle.
Check that the transformer connectors are properly fitted and free of oxidation before replacing it.
- 04
There is a burnt smell near the PCB (control board).
Cause: A transformer in short circuit can overheat and affect nearby components.
Cut off the power to the boiler immediately and inspect the transformer and its surroundings for dark stains or the smell of burnt plastic.
Junkers fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| F7 | The boiler does not detect the flame correctly. | An incorrect ionization signal may be due to a fault in the transformer. If the boiler does not ignite or shuts down, check the condition of the transformer, as it could be affecting the flame detection. |
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
- TJEZWC28
- Brand
- Junkers
- 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.
- Type/model and manufacturer code
- Typ EI 66/30 / BV 066-0213.0
- Reference engraved on the part
- 8747201252
- Secondary 2 (Pin 12-13)
- 9 V, 4.5 VA
- Manufacturer
- ERA
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
Which brand manufactures the transformer for the Junkers Euromaxx ZWC 28?
Which models are compatible with the transformer ERA TJEZWC28?
What secondary values does the transformer of the Euromaxx ZWC 28 have?
What fault code is documented for this transformer?
Is the ERA TJEZWC28 transformer compatible with other models of Junkers boilers?
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