Control Module with Display Junkers Bosch Cerapur ZWBC24-30
Control module with display Junkers Bosch Cerapur ZWBC24-30, reference 8748300923. This component is a PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, lock out, or exhibit erratic behavior, displaying the fault code F0: Internal error. It is installed in models from the Cerapur Comfort ZWBC range, such as the ZWBC 24-2C, ZWBC 25-2C, ZWBC 28-2C, and ZWBC 30-2C, among others. It is advisable to replace it upon detecting these symptoms.
VAT included
Consult via WhatsAppJunkers 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 |
|---|---|---|
| Junkers ZWBC 24-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| Junkers ZWBC 25-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| Junkers ZWBC 28-2C | Cerapur Comfort ZWBC (2C) | Contrasted |
| 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 remote control screen is off and nothing is visible, not even the backlight.
Cause: The control module is not receiving power or its internal electronics have failed, although the boiler may still be running.
Check that the connector or flat cable connecting the module to the rear PCB is properly seated and free of oxidation before replacing the module.
- 02
I can see the screen, but the auto, set, OK, +, and - buttons do not respond.
Cause: The membrane keyboard or the electronics that process the module's key presses have failed, even though the display remains lit.
Try pressing each button several times and see if any icon responds partially; that indicates whether the fault is in a specific area of the keyboard and not in the entire module.
- 03
The boiler heats up, but I can't change the temperature or the mode from the remote control.
Cause: The thermostat integrated into the module has lost control over the setpoint, although the rear PCB is still managing the ignition.
Check if the boiler is still operating at the temperature it was set to before the fault; if so, the problem lies in the control module and not in the power PCB.
- 04
The screen flickers or turns off and on by itself intermittently.
Cause: A loose connection in the module or an intermittent internal fault in the electronics causes these interruptions.
Carefully move the connection cable of the module while the boiler is running to see if the flickering matches the movement; this points to a connection issue rather than the module.
Fault codes from 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 Junkers 8748300923 PCB.
- Catalogue reference
- 8748300923
- Brand
- 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.
- Type of component
- Control module with display and integrated remote/thermostat (not the PCB)
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Junkers ZWBC 30-2C manual (PDF)Document © Junkers, provided as a technical reference.
Frequently asked questions about the PCB 8748300923
Is the control module with screen Junkers Bosch Cerapur ZWBC24-30, reference DECJ0501, the rear PCB of the boiler?
Is this module compatible with the Cerapur ZWBC28-2C boiler?
When is it necessary to replace the control module of the Cerapur ZWBC30-2C boiler?
What fault code is documented for this control board?
Is this control module compatible with other models in the Cerapur Comfort range?
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