Ignition Transformer ERA Junkers Euromaxx ZWC24/28-1MFA23 Ref. 8747201358
Ignition transformer manufactured by ERA (Type EI 66/30, BV 066-0213.0) for Junkers boilers in the Euromaxx range ZWC24, ZWC28, and ZWSE. It generates the high-voltage spark that ignites the burner. Primary at 230V 50/60Hz; two secondaries of 25V 34VA and 9V 4.5VA. It is replaced when the boiler does not ignite or fails to start due to ignition issues. The service reference 8747201358 corresponds to the engraved code 8747201252.
VAT included
Consult via WhatsAppJunkers 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
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 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 and faults that the ignition transformer 8747201358 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 ignite and there is no spark at any of the ignition electrodes.
Cause: The transformer does not supply current to the ignition electrodes.
Check that power is reaching both outputs of the transformer; if only one side fails, it could be the wiring and not the transformer.
- 02
The ignition is irregular across the burner, as if only part of it is lighting up.
Cause: If one of the two secondary windings of the transformer fails, only one electrode sparks and the ignition remains incomplete.
Check visually that both electrodes generate a spark at the same time before replacing the complete transformer.
- 03
The boiler locks out as soon as you try to turn it on, with hardly any sparking noise.
Cause: No power in the primary or with the winding interrupted, the control unit does not detect flame and locks out for safety.
With a multimeter, confirm that 230V is reaching the primary of the transformer before declaring it faulty.
- 04
The ignition fault appears mainly after a long period without using the boiler.
Cause: The accumulated moisture in the winding during shutdown can prevent the transformer from generating a spark correctly.
Let the boiler compartment dry for a few hours and try again before replacing the part, especially if it has been out of service for a long time or if there is moisture nearby.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F7 | The boiler does not detect the flame. | The ionization signal is incorrect. This may be due to a fault in the ignition transformer, affecting flame detection. If the boiler shuts down after attempting to ignite, the transformer could be the cause. |
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
- Brand
- Junkers
- Type of part
- Transformers
- Units in stock
- 5 units
- 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.
- Manufacturer
- ERA
- Type/model
- Typ EI 66/30
- Manufacturer code
- BV 066-0213.0
- Code engraved on the part
- 8747201252
- Primary voltage/frequency
- 230 V 50/60 Hz (Pin 5-7)
- Secondary 1
- 25 V 34 VA (Pin 10-11)
- Secondary 2
- 9 V 4.5 VA (Pin 12-13)
- The actual manufacturer of this part is ERA (Typ EI 66/30, BV 066-0213.0); Junkers/Bosch is the brand of the boiler, not the transformer.
- The same service reference 8747201358 has also been supplied with HAHN transformers (V 17976 / 8747201379 and V 19800 / 8737703010), which are electrically identical; if your part is HAHN instead of ERA, it is still the correct variant.
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 Junkers Euromaxx ZWC24/28-1MFA23?
My Junkers Euromaxx boiler requires reference 8747201358, but the transformer is marked 8747201252, is it the same?
Is this ERA transformer also sold under the HAHN brand?
What voltages does the Typ EI 66/30 transformer provide on the secondary side?
How many models are compatible with this transformer?
What documented fault code can indicate a problem with this transformer?
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