Saunier Duval Combitek F23E PCB Ref. ST1390 CAD 4685
The Saunier Duval Combitek F23E PCB, reference ST1390, is a control component that manages the ignition, burner modulation, pump, and safety features of the boiler. When this part fails, the boiler may not start, become locked, or behave erratically. It is installed in models such as Combitek F23E and Combitek C23E, among others. A technician must confirm through diagnosis whether it needs to be replaced upon noticing these symptoms to avoid malfunction in the heating system.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 05728600
- Warranty
- 1 year
Saunier Duval boilers compatible with reference 05728600
PCB with reference 05728600. Two confirmed compatibilities: Combitek F23E and Combitek C23E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Combitek F23E | Combitek | Contrasted |
| Saunier Duval Combitek C23E | 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. 05728600 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 05728600. 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 05728600
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 or attempt to start at any time.
Cause: The PCB does not send the ignition signal; if its control circuit fails, the boiler remains stopped.
Before changing the PCB, check that power is reaching it and that the thermostat or the programmer clock is not requesting to turn off.
- 02
The boiler does not respond to the panel controls: the buttons do nothing.
Cause: If the integrated circuit of the PCB fails, the buttons have no effect even though the display is on.
Try turning off and then turning on the boiler (full reset) before replacing the PCB.
- 03
The display shows a generic fault on the PCB without further details.
Cause: The electronics self-diagnose as the source of the fault when the fault does not correspond to any external component.
Check the manual for the exact fault code before purchasing: some 'PCB' faults may indicate the transformer or internal wiring.
- 04
The boiler ignites for a moment and then turns off by itself, without any apparent reason.
Cause: If the transformer supplying the PCB has an unstable voltage, the electronics may start the cycle and cut it off for safety.
Before changing the PCB, measure if the output voltage of the transformer is stable.
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 05728600 PCB.
- Catalogue reference
- 05728600
- Uniclima internal SKU
- PLCOBTK23
- 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.
- Silkscreen code
- ST1390 CAD 4685
- White label code
- 10063643
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Combitek F23E Manual (PDF) Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 05728600
What code do I need to check printed on my PCB to confirm that it is the one for the Combitek F23E?
What fault of the Saunier Duval Combitek F23E does changing this PCB solve?
What else is mounted on this PCB of the Combitek F23E, apart from the silkscreen code?
Spare parts related to Saunier Duval Combitek
