Junkers Cerapurcomfort PCB Zwbc 25 2 C 31 Ref. 8748300923
Control PCB for the Cerapur ZWBC 24-2 and 28-2 boilers, and CerapurComfort ZWBC 25-2 and 30-2 (also S3700 variants), in C23 and C31 versions. It is the main board that manages the operation of the boiler. It is replaced when the electronics fail and the boiler stops operating normally.
VAT included
Consult via WhatsAppBosch Junkers boilers compatible with reference 8748300923
PCB with reference 8748300923. Four confirmed compatibilities: ZWBC 24-2C and ZWBC 25-2C.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZWBC 24-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| Bosch Junkers ZWBC 25-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| Bosch Junkers ZWBC 28-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| Bosch Junkers ZWBC 30-2C | Cerapur Comfort ZWBC (2C) | 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. 8748300923 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 8748300923. 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 8748300923 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 does not ignite: there are no lights or noise.
Cause: The control board is not working, so the boiler ignition does not start.
First, check if there is a general power cut and inspect the fuse on the PCB before purchasing it.
- 02
The display shows an error that does not go away when turning the boiler off and on.
Cause: The electronics block operation upon detecting an issue with the parameters.
Find out which component indicates that error; in these models, it does not always refer to the PCB.
- 03
The boiler turns off by itself during the heating or domestic hot water cycle, for no apparent reason.
Cause: A fault in the electronic management interrupts the operation before completing it.
Observe if the shutdown occurs at the same moment in the cycle: this helps to differentiate between a fault in the PCB or the sensor.
- 04
In the S3700 versions, the unit does not recognize the remote control and does not accept temperature commands.
Cause: The PCB manages communication with the control unit, and a fault here prevents commands from reaching the boiler.
First, check the remote control (batteries, wiring, or pairing) to rule out that the problem is not with the PCB.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F0 | Internal error. | The PCB (control board) has an internal fault (e.g., A/D converter, memory, or power supply), triggering the "F0". Check voltages and wiring, encoder connections, and if the error persists after reset and testing, replace the PCB 8748300923. |
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 8748300923
- Catalogue reference
- 8748300923
- Brand
- Bosch Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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.
- voltage
- 400 V
- capacitor
- 470 nH
Frequently asked questions about the PCB 8748300923
Does this PCB work for my Cerapur ZWBC 28-2 C31?
Does this PCB work for the CerapurComfort ZWBC25-2C 23S3700 variant?
Is it the same PCB as reference 8748300923 without the S3700 variant?
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