Saunier Duval Thema NOx F25 B 2 Display Module Ref. 0020124927
When you open the hot water tap or turn on the heating, the Saunier Duval Thema NOX F25 B Display Module Ref. 0020124927 is responsible for controlling the ignition, the modulation of the burner, and the boiler pump. If this part fails, you will notice that the boiler does not start, gets locked, or exhibits erratic operation, potentially showing faults such as F11, F18, or F20. This module is compatible with the Thema NOx F25 B and Thema NOx F25 B 2 models, among others. A technician must confirm through diagnosis whether it needs to be replaced if you experience these issues, in order to restore its operation.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 0020124927
- Warranty
- 1 year
Saunier Duval boilers compatible with reference 0020124927
PCB with reference 0020124927. Two confirmed compatibilities: Thema NOx F25 B and Thema NOx F25 B 2.
Verified compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thema NOx F25 B | NOx Thema | Verified |
| Saunier Duval Thema NOx F25 B 2 | NOx Thema | Verified |
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 reference 0020124927 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 0020124927. 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 that require diagnosis on the PCB 0020124927
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 screen is off or blank, but the boiler heats and provides hot water normally.
Cause: The display module may fail without affecting the operation of the boiler.
Check that the flat cable or the connector between the display and the main PCB is properly connected before replacing the module.
- 02
Some segments or icons on the screen do not light up, or strange lines or symbols appear.
Cause: A fault in the module causes segments to be missing without affecting the rest of the electronics.
Note which specific symbols always fail: if it is constant, refer to the module and not to a specific contact fault.
- 03
The buttons do nothing when pressed, although the screen appears to be on.
Cause: The display and the buttons usually share the same circuit; a fault there leaves the display on but unresponsive to button presses.
Try cleaning the area around the buttons and check for moisture or dirt before replacing the entire module.
- 04
The screen flickers or turns off and on by itself intermittently.
Cause: A poor connection between the module and the main PCB causes power cuts only in the display section.
Check the connector and the wiring to the display before declaring the module faulty.
Fault codes Saunier Duval that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| F11 | No signal user interface (connection fault between panel and PCB). | The display module 0020124927 is not communicating with the main PCB due to a fault in the display itself or the connection harness/flat cable; the electronics detect a lack of signal from the interface. Check for 5 V and continuity at the interface connector and, if applicable, test with a trial display. |
| F18 | User interface fault. | Internal defect of the display module (panel PCB/control) preventing its identification and communication with the main PCB. Confirm power supply and connection; if they are correct, temporarily replace the display to rule out the part. |
| F20 | Software interface incompatible (incorrect interface or PCB/product code). | After replacing the display, the version/coding does not match the main PCB (e.g., product code not adjusted), causing incompatibility. Verify that reference 0020124927 is valid for F25 B/B2 and readjust the product code in the technical menu if necessary. |
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 0020124927
- Catalogue reference
- 0020124927
- Uniclima internal SKU
- DECNOXF25B2
- 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
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- CE marking / notified body number
- CE 1249
Frequently asked questions about the PCB 0020124927
Does this module, reference 0020124927, also work for the Thema NOx F25 without the suffix B/2?
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