What does fault code 12 mean in Saunier Duval?

User interface or remote control panel fault The control board/display does not respond on the bus (MMI) due to an internal fault or remote control fault. Check 5 V on the display, continuity of the MMI harness, and if it persists, try replacing the control module (05727900).

What does fault code 18 mean on Saunier Duval?

Local user interface fault. Inherent defect in the display/control platform electronics. Check power supply voltages and interface wiring; if correct and the error persists, replace the control module.

What does fault code 20 mean in Saunier Duval?

User interface not compatible with boiler The installed control board does not correspond with the variant/device code (DSN) of the boiler or is not coded. Verify the exact reference and reconfigure the variant/DSN or install the display compatible with the main PCB.

RefurbishedSaunier Duval PCBs (control boards)

Saunier Duval Combitek F23 Control Board PCB Ref. 05727900

Name: Saunier Duval Combitek F23 Control Board PCB Ref. 05727900
Brand: Saunier Duval
SKU: CEMCF23
Price: 20 EUR
Availability: InStock

20 €VAT includedIn stock · 1 unit

PCB (control board): refurbished spare part that controls the ignition, modulation, and safety features of the boiler. Useful if the boiler does not ignite, locks out, or the display is unresponsive. Reference 05727900. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days

1-year warranty

14-day return

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Key Data

Reference: 05727900
Brand: Saunier Duval
Type of part: PCBs (control boards)
Available units: 1 unit in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

Code	What does it mean?	Cause and diagnosis (this part)
12	User interface or remote control panel fault	The control board/display does not respond on the bus (MMI) due to an internal fault or the remote control. Check 5 V on the display, continuity of the MMI harness, and if it persists, try replacing the control module (05727900).
18	Local user interface fault	Intrinsic fault in the display/control platform electronics. Check power supply voltages and interface wiring; if correct and the error persists, replace the control module.
20	Interfaz de usuario no compatible con la caldera	The installed control board does not match the boiler's variant/device code (DSN) or is not coded. Verify the exact reference and reconfigure the variant/DSN or install the display compatible with the main PCB.