Saunier Duval Thelia 23E PCB Ref. 05712800
When you open the hot water tap or turn on the heating, the Saunier Duval Thelia 23E PCB controls the ignition, the modulation of the burner, the pump, and the safety features of the boiler. If it experiences faults, the boiler may not start, may lock out, or may operate erratically, displaying errors such as F.28, F.61, F.62, F.63, or F.64. This board is compatible with several models, including Thelia 23 E and 623 E, as well as Themis 23 E, among others. It should be replaced when these symptoms of malfunction are detected.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05712800
PCB with reference 05712800. Three confirmed compatibilities: 23 E and 623 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval 23 E | Thelia | Contrasted |
| Saunier Duval 623 E | Thelia | Contrasted |
| Saunier Duval 23 E | Themis | 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. 05712800 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 05712800. If it is not visible, do not identify the part by 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 05712800 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 won't start, no indicator lights turn on, and there's no sound when requesting heat.
Cause: The PCB is responsible for receiving the command and controlling the rest of the components. If it is damaged, no power reaches anything.
Check the fuse on the PCB and the power supply before declaring it dead.
- 02
A fixed fault code appears on the display that does not disappear even if the boiler is reset.
Cause: The PCB manages the reading of sensors and safety devices. An internal fault translates into a code that does not reset.
Note the exact code and consult it in your model's manual, as it sometimes indicates an external sensor rather than the PCB itself.
- 03
The boiler ignites the burner but shuts off by itself after a few minutes, without a clear pattern.
Cause: An intermittent fault in the PCB causes incorrect readings from the sensors and cuts off the gas for safety.
First, rule out the temperature sensors and the pressure switch, as they exhibit the same symptom and are cheaper to check.
- 04
The control or the thermostat cannot change the temperature or the mode of the boiler.
Cause: The PCB interprets the commands it receives from the remote control. If its communication circuit fails, it stops responding to them.
Try to operate the controls directly on the boiler to see if the fault is with the remote control or with the PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.28 | Fault: unsuccessful ignition on start-up | The PCB may fail (defective electronics) or have the multi-connector improperly plugged in, preventing ignition management; check power supply and ground connections, continuity of the harness, and seating of the multipin on the PCB before replacing it. |
| F.61 | Gas valve activation error | The PCB does not correctly control the gas valve (electronic fault) or shows a fault/short circuit in the driver; check the control output from the PCB, continuity/insulation towards the coils, and if there is no correct signal, replace the PCB. |
| F.62 | Gas valve disconnection delay error | An electronic fault in the PCB may maintain a delayed shutdown command or late flame detection; check the control signal at the gas valve terminals, and if the shutdown command persists without an external cause, replace the PCB. |
| F.63 | EEPROM fault | Fault in the PCB memory (EEPROM) or data corruption; confirm with resets/auto-test, check for stable voltages, and if the fault persists, replace the PCB. |
| F.64 | Electronic fault / NTC | The electronics of the PCB are declared faulty or misinterpret sensors due to an internal error; check sensors/harness and, if they are correct, the cause is the PCB. |
| F.65 | Fault: PCB temperature | The PCB detects overheating or a fault in its internal thermal circuit; check ventilation/environment and temperature in the electronic box, and if it reappears without an external cause, replace the PCB. |
| F.67 | Fault: electronics/flame | The ionisation signal is not plausible due to a fault in the flame circuit on the PCB; check the electrode/wiring and, if the signal remains abnormal with correct hardware, the cause is the electronics of the board. |
| F.70 | Invalid product code (DSN) | The display and/or printed circuit board has been replaced without reconfiguring the product code/DSN; check with the service menu and reprogram the code or, if not possible, replace/configure the correct PCB. |
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 05712800 PCB.
- Catalogue reference
- 05712800
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 2 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval 623 E manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 05712800
Is this PCB suitable for a Themis 23E or only for the Thelia?
Is the PCB for the Thelia 23E the same as for the Themis 23E?
Spare parts related to Saunier Duval Thelia
