Saunier Duval Combitek F23E PCB Ref. ST1990 CAO 4065
If the boiler does not start, locks out, or exhibits erratic behavior, a technical diagnosis must confirm whether you need the Saunier Duval Combitek F23E PCB Ref. ST1990. This component is responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. It is installed in models such as Combitek F23E and Combitek C23E, among others. The need for replacement of this board must be confirmed through diagnosis when faults in operation occur, ensuring proper control of the boiler processes.
- 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 respond to any commands: neither to the thermostat nor to the buttons on the unit itself.
Cause: The PCB is the only component that receives and processes those commands; if it gets stuck or loses power, the boiler does not respond.
Act directly on the buttons of the boiler, without using the thermostat, to rule out an external communication issue.
- 02
When turned on, a clicking sound is heard and the boiler stops for no reason.
Cause: That clicking sound is usually a relay on the PCB that switches and immediately cuts off due to a poorly received safety signal.
Observe if the clicking occurs at the same moment during ignition; this helps to determine if it is the PCB or the component that activates that relay.
- 03
The boiler's indicators are all flashing at the same time, which they didn't do before.
Cause: A flashing pattern different from the usual indicates that the PCB has entered an internal fault mode.
Compare the blinking pattern with the manufacturer's manual: many models indicate PCB faults this way.
- 04
After a power outage or a storm, the boiler stopped working completely.
Cause: The PCB is the most sensitive component of the boiler to voltage spikes, and a surge can damage it without leaving a visible mark.
Check if other appliances in the house experienced the same power cut; if so, first check the fuses and the circuit breaker of the installation.
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
- MODCK23
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 5 units
- 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
- ST1990 CAO 4065
- Edge code of the PCB
- 0310118100A1
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
Does this PCB fit in a Saunier Duval Combitek F23E boiler?
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