Saunier Duval Themafast NOx F 30 B 1 Display PCB Ref. 0020124928
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Saunier Duval Themafast NOX F 30 B 1 PCB. This part is responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may see the fault codes F11, F18, or F20 on the display. It is compatible with models from the Saunier Duval range, such as the Themafast NOx F30, among others. It is recommended to replace it when you experience these operational issues.
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Consult via WhatsAppSaunier Duval boilers compatible with reference 0020124928
PCB with reference 0020124928. A proven compatibility: Duval THEMAFAST NOx F30.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval THEMAFAST NOx F30 | Saunier | 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. 0020124928 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 0020124928. 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 0020124928 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 display does not turn on, although the boiler seems to be working.
Cause: The display module is not receiving power or is not communicating with the main PCB, which is why nothing is visible even though the rest of the equipment is functioning.
First, check that the boiler has power and that no fuse has blown on the main PCB before considering the display faulty.
- 02
The screen remains completely blank, with no icons or backlighting.
Cause: An internal fault in the display module prevents the image from being generated, even though power is still being supplied from the PCB.
Check the flat connector that connects the screen to the PCB: if it is poorly inserted or has a bent pin, it can simulate a dead screen.
- 03
The equipment heats normally but no data is visible on the control panel.
Cause: The combustion management and the display management are independent circuits, so one can fail without affecting the other.
Confirm that the boiler heats and provides hot water normally: if so, the fault is focused on the display module and not on the rest of the equipment.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F11 | Connection fault with the user interface (display). | The display PCB does not communicate with the main PCB (MMI/eBUS) or the harness between them is damaged; check power supply/5 V on the display and continuity of the wiring, and if applicable, test with a known good display. |
| F18 | User interface fault (display). | Fault in the display PCB (keyboard/screen) that prevents reading/sending signals; check the connectors and power supply of the display and, if it persists, replace the display PCB. |
| F20 | Software/coding incompatibility between PCBs. | After replacing the display PCB or the main PCB without parameterizing, the product code/coding does not match (IRIS/eBUS); verify and readjust the product code according to the manual or install a compatible display. |
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 Saunier Duval PCB 0020124928
- Catalogue reference
- 0020124928
- Brand
- Saunier Duval
- 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 0020124928
Does this display module fit the Saunier Duval Themafast NOx F30?
When should this display module be replaced in the Themafast NOx F30?
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