Saunier Duval Thelia/Themis 23E PCB 1330-A Ref. 05712800 Control Board
Saunier Duval control PCB, model PCB 1330-A, labeled 'Saunier Duval Multifonction'. It includes a transformer TR1 (23535-A, 24V), a 125 mA T fuse, and several relays: Zettler in positions REL5 and REL6, and Axicom V23105-A5005-A201 of 24VDC in an auxiliary relay. It is replaced when the electronic control fails and the boiler does not ignite or stops responding.
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 does not turn on and no indicator lights are visible on the panel.
Cause: The 125 mA T fuse protects the PCB; if it blows, it cuts off power to the entire control electronics.
Measure the continuity of the 125 mA T fuse with the multimeter before replacing the PCB.
- 02
There is no voltage reaching the control circuits even though the boiler is plugged in.
Cause: The 24V transformer TR1 powers the control section; if it fails, the PCB is left without working current.
Measure if there is 24V at the output of the transformer TR1 with the multimeter before replacing the entire PCB.
- 03
The pump or the gas valve do not operate even though the PCB seems to give the command.
Cause: Zettler relays or Axicom auxiliary relays can get stuck or stop closing contact with use.
Listen for the relay clicking when starting the demand; if it doesn't click, the fault is in the relay rather than in the rest of the PCB.
- 04
Blockages occur without any apparent mechanical cause, the boiler shuts off on its own.
Cause: A fault in the general electronic control causes the PCB to misinterpret the sensor signals and lock out for safety.
Check the fault code on the display and rule out sensor or pressure switch faults first, as they can also cause a lockout.
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
- 6 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Manufacturer
- Saunier Duval
- PCB code
- PCB 1330-A
- Manufacturing code (reverse)
- 103872 E / SFL 04 07
- Mains voltage
- 230 V
- Fuse
- 125 mA T
- Transformer (TR1)
- 23535-A, 24V 50/60Hz (6-10), 48V 0.05VA, ta 70/B
- Relay code
- RYA30024
- REL5 / REL6 relays
- Zettler
- Auxiliary relay (position 8)
- Axicom V23105-A5005-A201, 24VDC
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
What code does the PCB Ref. 05712800 of the Thelia 23E have?
Is this PCB Ref. 05712800 suitable for my Themis 23E?
What relays are mounted on the PCB 1330-A?
When should this PCB for the Thelia 23E be replaced?
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