Junkers Cerapur Comfort PCB Zwbc 30 2C Ref. 8748300923
The Junkers Cerapur Comfort Zwbc 30 2C PCB (Ref. 8748300923) is a component that controls the ignition, burner modulation, pump, and safety features of the boiler. If it fails, the boiler may not start, become locked, or operate erratically, displaying the fault code E9: STB activated. This PCB is compatible with models such as 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 to restore the normal 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 boiler does not ignite the burner, although the fan starts.
Cause: The PCB does not send the gas opening command because the flue validation is failing.
Check that the flue pipe is not blocked and that the pressure switch closes properly; it's not always the PCB.
- 02
The hot water takes a long time to come out or the temperature varies.
Cause: The PCB does not manage the flame modulation properly because the reading from the sensors is faulty.
Check the domestic hot water temperature sensor and its connection before assuming that the issue is with the PCB.
- 03
The boiler turns off by itself during combustion.
Cause: A fault in the PCB when processing a safety signal can cause it to interrupt the process prematurely.
Note the fault code if it appears; if it always repeats at the same point, provide that information before changing the spare part.
- 04
The display does not respond to the temperature adjustment buttons.
Cause: The keyboard or its reading by the microcontroller on the PCB may be failing.
Try cleaning the button contacts and resetting the boiler before considering it faulty.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E9 | STB activated | When you see "E9" on the display, it means that the STB has been activated. This may be due to a fault in the PCB that prevents the proper functioning of the boiler. Check the NTC input, the operation of the pump, and the fuse of the printed circuit. |
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
- Delivery time shown at checkout
- Return
- 14 days
- The code 'B0BV443S8TX' resembles an Amazon ASIN, not a manufacturer reference: do not use it to search for equivalents.
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 this PCB work for a Junkers Cerapur ZWBC 28-2C?
Does the code B0BV443S8TX serve as a reference to order the PCB for the ZWBC 25-2C?
Spare parts related to Junkers Cerapur Comfort ZWBC (2C)
