Saunier Duval Isotwin F 24 E PCB - Ref. 120404/9

Saunier Duval boilers compatible with reference 120404 9

PCB with reference 120404 9. 33 confirmed compatibilities: F 25 E and F 24 E.

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. 120404 9 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 120404 9. 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 120404 9 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 ignite and there are no active indicator lights.

  Cause: The protection fuse of the PCB may have blown, leaving it without power.

  Visually inspect the fuse on the PCB, looking for a broken internal wire or a blackened glass.

• 02

  The boiler shuts down suddenly, without warning and for no apparent reason during operation.

  Cause: An intermittent fault in the control electronics can cause a shutdown that the PCB interprets as a safety stop.

  Note when it turns off, during startup, while running, or when requesting domestic hot water, to identify if the fault is with the PCB or another component.

• 03

  The differential or the main fuse of the house trips when connecting the boiler.

  Cause: A short circuit in the control board can cause current to ground and trip the main protection.

  Disconnect the boiler from the network and check if the differential stops tripping; if the problem persists without the boiler connected, it is not the PCB.

• 04

  The display or the indicators are flashing without showing a clear fault code.

  Cause: It could be a communication fault between the control board and the display, not necessarily a total failure of the board.

  Check the flat connector or the wiring between the PCB and the display before replacing the control board.

Fault codes from Saunier Duval that this spare part resolves.

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 120404 9 PCB.

Catalogue reference

120404 9

Brand

Saunier Duval

Type of part

PCBs (control boards)

Units in stock

2 units

Status

Refurbished

Warranty

1 year

Shipping

Delivery time shown at checkout

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.

PCB code

IRIS1.0 / 735004 V087_C

Barcode

4000 120404/9

Production date

008 04/11 (likely week 08 of 2011)

Fuse

125mA T / USE 250V

Transformer manufacturer

Myrra

Integrated circuit driver

ULN2803A (Toshiba)

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Saunier Duval S C 24 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.