Version and connections
The PCB's shape alone is not enough to confirm that it is a suitable replacement. The service part number and installed variant complete the identification; programming or pinout cannot be inferred from a photo.

Junkers ZWR2 4-2ADE23 S0404 electronic PCB · Refurbished auxiliary PCB. Yellow auxiliary board with a blue encapsulated block and two transparent relays. Check the PCB code, revision and connectors; sharing the boiler model alone is not enough to confirm equivalence.
To identify the PCB, compare its labels and the layout of the connectors, relays and mounting points. A boiler family may include variants that need to be checked.
Compare the views from the same angle and check the complete identification of the removed part.
Choose a photo of your part to view it beside this unit. Compare the labels, connectors and mounting points from the same angle.
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Application listed in the catalogue: Junkers ZWR2 4-2ADE23 S0404. The variant and configuration must match the installed equipment; this does not establish compatibility with other models.
No models are documented for that search.
The application is listed in the catalogue and must be checked against the installed variant. Compatibility has not been confirmed against an exploded parts diagram.
The PCB's shape alone is not enough to confirm that it is a suitable replacement. The service part number and installed variant complete the identification; programming or pinout cannot be inferred from a photo.
We repair boilers in Madrid and the surrounding areas. Installation is arranged separately from the purchase of the part.
Yellow auxiliary board with a blue encapsulated block and two transparent relays. Compare these details with the removed part and its full identification.
To recognize the PCB, compare its labels and the distribution of connectors, relays and fixation points. The same Boiler family may have variants that require checking. Compare views from the same angle and complete Part identification removed.
This product page identifies the catalogued application Junkers ZWR2 4-2ADE23 S0404. It does not establish equivalence with other versions; service documentation linking Part to the specific model is required to extend compatibility.