PCB For Boiler ZWB 25-2 / ZWBC 24-2 A 30-2 / ZWBE 37-2 Ref. 8748300923
PCB for boilers ZWB25-2, ZWBC24-2, ZWBC25-2, ZWBC28-2, and ZWBC30-2 (C23/C31), and ZWBE37-2 A23. 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 thermostat is calling for heat and the boiler is not responding.
Cause: The PCB is not receiving the signal from the thermostat correctly, so the boiler does not activate.
Check the wiring of the thermostat at the connector of the PCB; a loose wire can cause the same problem as a faulty board.
- 02
The fault only appears when the boiler is at maximum demand, with several taps open or a lot of heating.
Cause: A fault in the PCB that manifests under load may be caused by a component that heats up and fails with prolonged use.
Note whether the fault occurs always under high demand or also at rest; if it only happens under load, indicate this when purchasing to better identify the fault.
- 03
Over time, a function of the boiler, whether for domestic hot water or heating, takes longer to respond.
Cause: A output from the PCB that degrades may fail progressively before completely stopping functioning.
Compare the current response time with that of a few weeks ago; if the deterioration is gradual and only affects one function, it could be that output from the PCB.
- 04
The boiler locks with the same fault just after resetting it, without time to ignite.
Cause: If the PCB detects the same fault immediately after the reset, it is likely that there is an internal fault that is not related to specific usage.
Try resetting two or three times with a few minutes in between; if the lockout is instantaneous and always the same, it is a strong indication of a problem with the PCB.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| A8 | Communication interrupted | There is a communication problem between the components of the boiler. This may be due to a fault in the PCB. Check the electrical connections and verify the condition of the board. |
| C6 | The fan is not working. | The boiler fan is not operating. This can cause overheating and faults in the system. Check if the fan is receiving power and verify the condition of the PCB. |
| EA | Flame not detected | The boiler is not detecting the flame. This may be due to a fault in the PCB. Check that there is gas and that the ignition is working properly. |
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
- 2 units
- 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.
- frequency
- 50 Hz
- power
- 470 µF
- current
- 1 nF
- material
- TDK
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Bosch Junkers ZWBC 24-2C Manual (PDF)Document © Bosch Junkers, provided as a technical reference.
Frequently asked questions about the PCB 8748300923
Is this PCB suitable for my boiler ZWBE 37-2 A23?
Is this PCB suitable for the ZWB 25-2 C31?
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