Saunier Duval Main PCB SD 623 Combi Ref. 05159600
RefurbishedSaunier DuvalPCBs (control boards)

Saunier Duval Main PCB SD 623 Combi Ref. 05159600

55 €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. Compatible with SD 623, SD 623 Combi, Thelia 623 (ref. 05159600). Includes a one-year warranty and delivery within 2–4 working days in the EU.

1
Consult via WhatsApp
Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
05159600
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

The same part (ref. 05159600) equips these models. Verified compatibility; check the reference before purchasing.

SD 623 / Thelia 623 (Combi)

  • SD 623
  • SD 623 Combi
  • Thelia 623
  • Thelia 623E

Thema / Themis 23 (equivalent family of the same chassis 623)

  • Thema 23
  • Themis 23E
  • Themis 623E

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.

CodeWhat does it mean?Cause and diagnosis (this part)
F11No signal is reaching the main circuit.The control/display PCB (user interface) is not communicating with the main PCB due to a fault in the interface itself or its wiring/connection. Verify by measuring power supply to the interface and continuity of the harness/flat cable, and test with a known interface or by reconnecting the UI–PCB connector.
F12No user interface signal.The control/display board does not send a signal (or does not receive it) due to a fault in the interface or a poor connection between the interface and the main board. Check the 5 V/12 V power supply to the interface, inspect/clean the UI–PCB connector, and if the issue persists, replace the interface.
F18User interface fault.Internal fault of the control/display PCB causing lockout or erratic readings. Check with reset and measure interface voltages; if it does not respond or the fault recurs, replace the interface PCB.
F20Software interface incompatible with the model.User interface (display board) incompatible or improperly configured after replacement, causing the main board to reject the identification. Verify the code/product and reconfigure/update; if incorrect, install the compatible interface/display.
How do I know if this PCB is for my boiler?
Check the reference 05159600 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Saunier Duval part.
What is it used for?
The PCB controls the ignition, modulation, sensor readings, and safety features of the boiler.
Is the boiler not igniting, locking out, or is the control board unresponsive?
After ruling out mains voltage, fuse, and connectors, a damaged PCB causes lockouts, blackouts, or erratic display. Repair the external cause before installing the new one.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations
After installation, a technician must adjust the service parameters (type of gas, power settings) and check combustion and safety features.
What does refurbished mean and what coverage does it have?
Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Spare Parts Related Boiler SD 623 Combi

Scroll to the top