Saunier Duval Themafast Condens F25 1 Display Ref. 20018473
The Saunier Duval Themafast Condens F25 1 Ref. 20018473 is a control PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or exhibit erratic behavior. This part is compatible with models such as the Themafast Condens F30, among others. It should be replaced when experiencing operational issues or when the fault code F.70 is displayed: Invalid product code (DSN).
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Consult via WhatsAppSaunier Duval boilers compatible with reference 20018473
PCB with reference 20018473. A proven compatibility: Themafast Condens F30.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Themafast Condens F30 | Themafast Condens | 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 reference 20018473 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 20018473. 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 20018473 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 control unit remains completely off, with no lights, when power is supplied to the boiler.
Cause: If the display module is damaged, the power does not reach the matrix or the backlighting even though the boiler receives normal power.
Before changing it, check that the main switch and the fuse of the boiler are functioning properly, to rule out that the problem is with the power supply and not with the control itself.
- 02
You press reset, mode, + or - and nothing happens, even though the screen seems to have some light.
Cause: The keyboard or button membrane is a separate component from the display and can fail on its own.
Test each button separately several times; if none respond at all, the fault is usually in the remote control itself and not in the main PCB.
- 03
The image on the control panel flickers, turns off, and turns back on by itself when touching the front.
Cause: The connector or flat cable that connects the control with the main PCB may have a poor connection.
Carefully open the front panel, check the connector, disconnect it, and reconnect it before considering the part defective.
- 04
Nothing can be programmed or adjusted from the remote control, although the boiler seems to continue heating.
Cause: This component is the interface between the user and the PCB: if it fails, the boiler may continue to operate with the last setpoint even though nothing is visible or controllable.
Check if hot water is coming out or if the heating is still working with the previous setting; if so, the fault is in the control and not in the combustion system.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.70 | Invalid product code (DSN) | The installed display module/display board is incompatible or was replaced along with the main PCB without reprogramming the variant (DSN), generating a coding fault. Verify by reading d.93 and comparing with the identification plate; confirm the reference/compatibility of the display and recode or replace 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 20018473 PCB.
- Catalogue reference
- 20018473
- 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 20018473
Does this remote control work for both the Themafast Condens F24 and the F30?
When should the front control panel of the Themafast Condens be replaced?
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