Junkers Bosch CerapurComfort PCB ZWBE 25-3C / 30-3C Ref. 8718648375
If your boiler does not start, gets blocked, or shows erratic behavior, you may need the Junkers Bosch CerapurComfort ZWBE 25-3C / 30-3C PCB. This control board is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may notice the fault code EA: Flame not detected. It is compatible with several models from the Cerapur Comfort range, such as the ZWBE 25-3 C 23 and ZWBE 30-3 C 31, among others. It is recommended to replace it when showing signs of malfunction.
VAT included
Consult via WhatsAppBosch Junkers boilers compatible with reference 8718648375
PCB with reference 8718648375. Four confirmed compatibilities: ZWBE 25-3 C 23 and ZWBE 25-3 C 31.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZWBE 25-3 C 23 | Cerapur Comfort ZWBE 25/30-3 C | Contrasted |
| Bosch Junkers ZWBE 25-3 C 31 | Cerapur Comfort ZWBE 25/30-3 C | Contrasted |
| Bosch Junkers ZWBE 30-3 C 23 | Cerapur Comfort ZWBE 25/30-3 C | Contrasted |
| Bosch Junkers ZWBE 30-3 C 31 | Cerapur Comfort ZWBE 25/30-3 C | 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. 8718648375 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 8718648375. 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 PCB 8718648375 resolves.
The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler suddenly shuts off in the middle of a shower or with the heating on, without any prior warning.
Cause: A relay on the PCB intermittently loses contact, which can cut off the supply without displaying a fault code.
Check if the shutdown coincides with vibrations, if you touch the boiler, or if it has been running for a long time, before declaring the PCB faulty.
- 02
You can hear the relay on the PCB clicking several times in a row, but the boiler does not ignite.
Cause: The relay tries to close the contact to allow ignition, but if it does not achieve this stably, the ignition is not completed.
Count how many clicks it makes before it locks up and if the pattern repeats in each attempt; this helps to confirm that the fault is in that relay on the PCB.
- 03
The remote control or the boiler app occasionally loses connection, even though the home Wi-Fi is working fine.
Cause: The module that communicates the PCB with the control or the app may fail intermittently before it stops working completely.
First, reset the remote control or the connection module separately; if the fault persists only with the PCB, a router reset will not solve it.
- 04
The boiler resets itself, as if the power had been cut and restored, without anyone touching it.
Cause: An internal fault in the PCB can cause spontaneous reboots of the microprocessor that controls it.
Keep track of how many times it resets per day and if it coincides with the use of other appliances on the same electrical panel, to rule out an external supply issue.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| EA | Flame not detected | The boiler does not detect the flame. This may be due to a fault in the ignition or in the flame sensor. If you see this error, check the PCB, as a problem with it may prevent the correct detection of the flame. |
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.
Data sheet for the Bosch Junkers PCB 8718648375
- Catalogue reference
- 8718648375
- Brand
- Bosch Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- 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.
- Power relay model mounted on the PCB
- OMRON G5RL-1A-E-HR
- Power relay voltage
- 24V DC
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Bosch Junkers ZWBE 30-3 C 31 Manual (PDF)Document © Bosch Junkers, provided as a technical reference.
Frequently asked questions about the PCB 8718648375
What relay is mounted on the PCB of the ZWBE 30-3 C31?
Is this PCB suitable for the CerapurComfort ZWBE 25-3 C23?
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