Junkers Cerastar PCB ZWN 24 7 MFA Ref. 8748300949
The Junkers Cerastar ZWN 24 7 MFA PCB, with reference 8748300949, is a key component that controls the ignition, modulation, and safety features of the boiler. If this part fails, you may notice a fault code F0, which indicates an internal fault in the PCB, potentially causing the boiler to malfunction. This board is compatible with models such as Cerastar ZWN 24-7 MFA 23 and 31S, among others. It is recommended to replace it when there are ignition issues or temperature regulation failures.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8748300949
PCB with reference 8748300949. Two confirmed compatibilities: Cerastar ZWN 24-7 MFA 23 (7716010472) and Cerastar ZWN 24-7 MFA 31S (7716010473).
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers Cerastar ZWN 24-7 MFA 23 (7716010472) | Cerastar ZWN 24-7 MFA | Contrasted |
| Junkers Cerastar ZWN 24-7 MFA 31S (7716010473) | Cerastar ZWN 24-7 MFA | 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 ref. 8748300949 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 8748300949. 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 8748300949 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 respond when turned on: the display and the indicators do not light up, nothing at all.
Cause: The PCB is the one that powers and controls all the electronics of the boiler; if the part that receives the current fails, no electricity reaches any component.
Before changing the PCB, check that the boiler is receiving power: inspect the plug, the circuit breaker, and the main fuse of the house.
- 02
The remote control or the wall thermostat does not control the boiler, although the remote works fine separately.
Cause: The communication between the control and the boiler is managed by the PCB; if that part fails, control is lost even if the control is functioning properly.
Check the connectors and wiring between the control and the PCB before assuming that the board is faulty.
- 03
The boiler turns off by itself while operating and sometimes it turns back on without any intervention.
Cause: The relays on the PCB that control the pump, the gas valve, and the fan wear out with use and fail intermittently before completely stopping functioning.
Check if the shutdown always occurs at the same moment in the cycle (start, adjustment, stop) to determine if it is the PCB or the component that controls it.
- 04
The screen flickers, turns off and on by itself, or displays meaningless symbols.
Cause: A fault in the internal power supply of the PCB or in its microcontroller is usually noticed first on the display before the boiler completely locks out.
Cut and reconnect the power for a few seconds and check if the fault reappears immediately; if it comes back quickly, it is likely to be the PCB.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F0 | Internal fault in the PCB | The PCB of the boiler has an internal problem. To check it, review the contacts and the power supply, as well as the ignition cables and the fuse of the board. If the fault persists, you will need to replace the board. |
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 8748300949 PCB.
- Catalogue reference
- 8748300949
- 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
Frequently asked questions about the PCB 8748300949
Does this PCB work for my Junkers Cerastar ZWN 24-7 MFA31S?
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