Saunier Duval Display Module Keyboard Isofast F35 Ref. 05721000
RefurbishedSaunier DuvalPCBs (control boards)

Saunier Duval Display Module Keyboard Isofast F35 Ref. 05721000

15 €VAT includedIn stock · 5 units

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 up, or the display does not respond. Compatible with C 28 E, C 28 E1, C 28 E NOX (ref. 05721000). 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
05721000
Brand
Saunier Duval
Type of part
PCBs (control boards)
Available units
5 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 05721000) equips these models. Verified compatibility; check the reference before purchasing.

Isofast

  • C 28 E
  • C 28 E1
  • C 28 E NOx
  • C 28 E1 NOx
  • C 35 E
  • C 35 E1
  • F 28 E
  • F 28 E1
  • F 35 E
  • F 35 E1

Isomax

  • C 28 E
  • C 28 E2
  • F 28 E
  • F 28 E2

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)
F12No signal from the user interfaceYes — it points to this display/interface module or its connection cable with the main PCB.
F18User interface faultYes — it corresponds to this display/control board module.
F13Main PCB faultNo — that code is for the MAIN PCB (a different part), not for this display.
How do I know if I need the display and not the main PCB?
Fault codes F12/F18 (user interface) and screen or keyboard faults point to this module; F13 is related to the main PCB. Check the reference 05721000 printed.
Which models is this display compatible with?
It is a module shared by several models of the same range (see Compatibility tab). If your model does not appear, send us a photo of the silkscreen and we will confirm it.
Is it difficult to change?
It is the front module; it is replaced without touching the power PCB. Cut the power and carefully replicate the connection of the flat interconnection cable.
What is the difference with the main PCB?
The display shows the information and receives the user's commands; the main PCB controls the ignition, modulation, and safety features. They are different components.
Why does a display fail?
It is usually due to humidity, interconnection cable fault, impacts, or aging of the LCD/keyboard.
What does refurbished mean and what coverage does it have?
Module removed from an out-of-service boiler, inspected and tested; not factory new. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

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