Main Control PCB Junkers Cerapur Comfort Zwbc 30 2 C 23 Ref. 8748300923
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Junkers Cerapur Comfort Zwbc 30 2 C 23 Main Control PCB. This control board manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may notice the error F0: Internal error. This part is compatible with several models in the Cerapur Comfort ZWBC range, such as the ZWBC 24-2C and the ZWBC 30-2C, among others. It is recommended to replace it when there are faults in the operation of the boiler.
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 three-digit display does not turn on at all, even though the boiler has power.
Cause: The display depends on the PCB for power; if the PCB fails in its output, the display will not light up even if the boiler is powered.
Check with a multimeter that voltage is reaching the PCB before assuming the fault is with it or the display.
- 02
The boiler takes a long time to ignite, makes several spark attempts, and eventually locks out.
Cause: The PCB controls the ignition time; if there is a fault, the process is prolonged or stopped.
Check the ignition electrode and its distance before attributing the fault to the PCB.
- 03
The buttons on the panel do not respond or respond with a delay, as if the boiler is not responding to the user.
Cause: The PCB interprets the pulses; if there is a fault in its circuit, there may be delays or it may not respond.
Press several times and wait a few seconds: if the delay is consistent across all buttons, it points more towards the PCB than a loose button.
- 04
The boiler switches between heating and domestic hot water on its own without anyone touching the control.
Cause: The PCB decides which function to prioritize; a fault in its logic can cause it to change modes without user intervention.
Note if the change coincides with the opening of a hot water tap: if so, it may be a fault with the flow sensor, not the PCB.
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
- 4 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
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
Does the reference PCB 8748300923 fit a CerapurComfort ZWBC 30-2 C 23?
Does this PCB also work for a Cerapur ZWBC 24-2 C 23?
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