Saunier Duval Thema C 23 E Control Board Ref. 05745900
The Saunier Duval Thema C 23 E Control Board is an electronic component 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, displaying fault code 13: The control board is not functioning properly. This board is compatible with several models in the Thema range, such as the F 23 E and the C AS 23 E, among others. It is recommended to replace it upon noticing any of these symptoms to avoid further issues.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05745900
PCB with reference 05745900. Eight confirmed compatibilities: F 23 E and C 23 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 23 E | Thema | Contrasted |
| Saunier Duval C 23 E | Thema | Contrasted |
| Saunier Duval F AS 23 E | Thema | Contrasted |
| Saunier Duval C AS 23 E | Thema | Contrasted |
| Saunier Duval F 23 E | Themaplus | Contrasted |
| Saunier Duval C 23 E | Themaplus | Contrasted |
| Saunier Duval F 23 E | Combitek | Contrasted |
| Saunier Duval C 23 E | Combitek | 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. 05745900 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 05745900. 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 05745900 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 and does not respond to the buttons on the panel.
Cause: The microcontroller on the PCB, which controls everything, has stopped working.
Disconnect the boiler from the power supply for a few minutes and then reconnect it. Sometimes, this resolves a blockage before considering replacing the PCB.
- 02
The boiler locks up halfway through a cycle and does not respond.
Cause: There is a problem with the control chip that prevents the PCB from completing the ignition or operation cycle.
Check if there is any fault code or blinking pattern on the display: this can confirm if the problem is with the PCB.
- 03
The boiler does not control the temperature or the operating times properly.
Cause: The electronic part that regulates these parameters is not processing the signals from the sensors correctly.
Before changing anything, check that the temperature sensors are not giving erratic readings, as a faulty sensor could appear to be a problem with the PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 13 | The control board is not functioning properly. | The control board has an internal problem that prevents the boiler from functioning properly or managing signals. Check that the board is receiving power and that the low voltages, such as 5 V, are correct. Also, check the fuse and the connectors. If all the wiring and the user interface are correct and the problem persists, the board needs to be replaced. |
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 05745900 PCB.
- Catalogue reference
- 05745900
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Main chip - manufacturer
- Zilog (by logo)
- Main chip - code
- 023_08 (first block of digits uncertain; suffix _08 confirmed)
- Secondary chip - manufacturer
- STMicroelectronics (by the ST logo)
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thema C 23 E Manual (PDF)Installation and user manual for the Saunier Duval Thema C 23 E boiler, in Spanish. Document provided by Uniclima as a technical reference.
- Saunier Duval F 23 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 05745900
What boiler is this control board Ref. 05745900 for?
What fault justifies replacing this PCB in the Thema C 23 E?
Spare parts related to Saunier Duval Thema
