Junkers Power Supply Transformer HAHN V17976 Ref. 8717201052
Transformer without confirmed manufacturer or code in this unit: the available photo is of the rear side and only shows the marking '741' on the casing, which seems to be a batch or mold number, not a product reference. The main technical label could not be read. Compatible with Junkers boilers from the Cerapur and CerapurSolar range according to the indicated model list.
Junkers boilers compatible with reference 8717201052
Ignition transformer with reference 8717201052. Six confirmed compatibilities with two independent sources: Comfort ZWBC 24-2 C and Comfort ZWBC 25-2 C. Verify the printed reference on your part before purchasing.
Compatibility confirmed
| Boiler model | Family | Verification |
|---|---|---|
| Junkers Comfort ZWBC 24-2 C | Cerapur | Confirmed · 2 sources |
| Junkers Comfort ZWBC 25-2 C | Cerapur | Confirmed · 2 sources |
| Junkers Comfort ZWBC 30-2 C | Cerapur | Confirmed · 2 sources |
| Junkers ZWB 25-2 C | Cerapur | Confirmed · 2 sources |
| Junkers ZWB 28-3 C | CerapurSmart | Confirmed · 2 sources |
| Junkers CSW 30-3 A | CerapurSolar | Confirmed · 2 sources |
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. 8717201052 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.
- Locate the reference printed on the body of the ignition transformer you have installed: it should indicate 8717201052.
- Check your boiler model on the nameplate and look for it in the list of compatible models on this page.
- Compare the connections and the body with the original part before installing.
- If you have any doubts, send us a photo of the screen printing via WhatsApp and we'll confirm it for you before you purchase.
Symptoms and faults resolved by ignition transformer 8717201052
The ignition transformer generates the high voltage for the spark of the electrodes. These are the typical symptoms and what to do:
The boiler does not respond to anything: neither the display, nor the indicators, nor the ignition attempt.
Cause: Without the voltage supplied by the transformer to the PCB, it cannot initiate any process of the boiler.
Before replacing the part, confirm with a multimeter that mains voltage is reaching the transformer and that the main boiler fuse is intact.
The boiler stops on its own after a few minutes of operation and then starts up again without anyone touching anything.
Cause: A transformer that loses voltage when it heats up momentarily cuts power to the PCB, which resets when it cools down.
Note if the fault always appears after the same amount of usage time; it helps to differentiate a transformer that heats up from another intermittent fault.
The control or display shows a fault code related to power supply failure or PCB, without a clear pattern.
Cause: Voltage drops in the secondary of the transformer are translated on the PCB as power supply faults, even though the origin is in the transformer itself.
Check the manual for the specific fault code given by the boiler and confirm that it corresponds to a power supply issue before replacing the transformer.
When moving or touching the wires near the transformer, the boiler reacts: it turns on, turns off, or changes the fault displayed.
Cause: A corroded terminal or a loose solder joint in the transformer causes intermittent contact that is noticeable when moving the wiring.
With the boiler turned off, visually inspect the transformer terminals for rust, looseness, or loose wires.
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 8717201052
- OEM reference
- 8717201052
- Brand
- Junkers
- Type of part
- Transformers
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
- This unit does not show the main technical label in the available photo (rear/pin view); the manufacturer and part code cannot be confirmed.
- The marking '741' is read on the casing, which due to its format seems to be a batch or mold code, not the product reference. Do not use it as a purchase reference.
- The current catalog lists reference 8717201052, without confirmation against the label or external sources. Check the part you have before ordering.