Saunier Duval Combitek F23E PCB Ref. ST1990 CAO 4065

Saunier Duval boilers compatible with reference 05728600

PCB with reference 05728600. Two confirmed compatibilities: Combitek F23E and Combitek C23E.

Proven compatibility

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

What determines it is not the boiler model, but the reference printed on the part you already have installed.

1. 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.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms and faults that the PCB 05728600 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 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

Brand

Saunier Duval

Type of part

PCBs (control boards)

Units in stock

5 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.

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.