Junkers Bosch CerapurSmart PCB Ref. 8748300914
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Junkers Bosch CerapurSmart PCB Ref. 8748300914. This part is responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may observe faults such as F0, A8, b1, F7, or Fd. It is compatible with models from the Cerapur Smart range, such as the ZWB 28-3C 23 and the NWB 24-3CE 23, among others. It is recommended to replace it as soon as these symptoms are detected to avoid further issues.
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Consult via WhatsAppBosch Junkers boilers compatible with reference 8748300914
PCB with reference 8748300914. Four confirmed compatibilities: ZWB 28-3C 23 and ZWB 28-3CE 23.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZWB 28-3C 23 | Cerapur Smart | Contrasted |
| Bosch Junkers ZWB 28-3CE 23 | Cerapur Smart | Contrasted |
| Bosch Junkers NWB 24-3C 23 | Cerapur Smart | Contrasted |
| Bosch Junkers NWB 24-3CE 23 | Cerapur Smart | 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 the reference 8748300914 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 8748300914. 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 8748300914 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 and the display is off.
Cause: The PCB is not receiving the necessary power and cannot initiate the ignition.
Check the main switch, the differential switch of the house, and the fuse of the boiler before considering that the PCB is the cause.
- 02
An error code is displayed and the boiler does not start on its own.
Cause: The control detects an incorrect value in its electronics and blocks operation for safety.
Check the meaning of the code: in versions C and CE, some codes may indicate problems with the sensor or the expansion vessel, not with the control board.
- 03
The modulating control loses connection with the boiler and displays 'no communication'.
Cause: The PCB manages the communication bus with the control unit, and a fault in this part interrupts the connection.
First, check the wiring or the remote control battery: a communication fault is not always the fault of the PCB.
- 04
The boiler starts and stops several times without any change in the heating demand.
Cause: A fault in the electronic ignition management causes shutdowns that do not correspond to the actual demand.
Observe whether the irregular cycle occurs when starting cold or also during stable operation, to identify the source.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F0 | Incorrect reference voltage (internal fault). | Fault in the reference/measurement of the Heatronic 3 (5 V/ADC) on the board causes F0; if after checks and retries it continues, the manufacturer advises replacing the board. Verify reference voltages and follow the manual's flow; if it persists, change the PCB. |
| A8 | BUS communication interrupted. | The BUS management (Heatronic 3) is on the PCB; a fault in the transceiver/micro or the PCB itself interrupts communication even with correct wiring/regulator. Check the BUS cable and regulator; if A8 persists, replace the PCB according to the manual. |
| b1 | Internal error or coding plug not detected/incorrect. | The encoder reads the input from the PCB; if that circuit fails, b1 appears even if the encoder is correct. Restore parameters and check the encoder; if b1 continues, the procedure requires changing the PCB. |
| F7 | Flame detected while the appliance is off (false flame). | The ionization stage on the PCB may leak (e.g., moisture on the PCB) and simulate a flame. Check electrodes/draught and ensure the PCB is not damp; if F7 persists, replace the PCB as indicated in the documentation. |
| Fd | The RESET button has been pressed by mistake (flashing). | If Fd does not disappear after resetting, the manual attributes it to an electronic fault (key detection/logic) of the Heatronic front panel. Retry the reset procedure; if the blinking persists, replace the PCB. |
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 8748300914
- Catalogue reference
- 8748300914
- 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.
- Part reference
- 8748300914
Frequently asked questions about the PCB 8748300914
Is the reference 8748300914 for the Junkers Bosch CerapurSmart PCB confirmed?
Is this PCB compatible with the Cerapur Smart ZWB 28-3C 23 boiler?
How many models are compatible with the PCB 8748300914?
What fault codes are documented for this PCB?
What is the reference for this PCB?
Does the PCB 8748300914 work for the boiler NWB 24-3C 23?
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