Saunier Duval Isofast C 35 E Display Ref. S1072300
In Saunier Duval Isofast boilers, the Isofast C 35 E display is a control PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may notice that the boiler does not start, locks out, or exhibits erratic behavior. This part is compatible with models such as F 30 E, F 35 E, F 30 E H-MOD, F 35 E H-MOD, F 35 EA, and F 35 E Condens, among others. It is recommended to replace it upon detecting symptoms of malfunction or if fault codes F12, F18, or F13 appear.
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Consult via WhatsAppSaunier Duval boilers compatible with reference S1072300
PCB with reference S1072300. Seven confirmed compatibilities: F 30 E and F 35 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 30 E | Isofast Condens | Contrasted |
| Saunier Duval F 35 E | Isofast Condens | Contrasted |
| Saunier Duval F 30 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 35 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 35 EA | Isofast | Contrasted |
| Saunier Duval F 35 E | Isomax | Contrasted |
| Saunier Duval Condens F 35 E | Isomax | Contrasted |
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. S1072300 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.
- Find the reference printed on the installed part and check whether it matches the catalogue reference S1072300. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the PCB S1072300 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 turn on: there are no lights, no display, and no sound.
Cause: The PCB controls all the electronics of the boiler; if the power supply fails, no current reaches anything.
Check that there is power at the boiler's input and that the main fuse is in good condition.
- 02
The boiler ignites, but it does not respond when requesting heating or domestic hot water.
Cause: The PCB receives the demand from the thermostat and activates the pump and ignition; if the microprocessor or the relays fail, the command is not executed.
Check that the thermostat or the control is functioning properly and that the connectors to the PCB are not loose or corroded.
- 03
The boiler turns on, operates for a while, and then shuts off for no apparent reason, sometimes displaying different fault codes.
Cause: An intermittent fault on the PCB (such as faulty solder joints or capacitors) can cause errors that do not always point to the same component.
Note the exact fault code for each shutdown before changing the PCB: if it is always the same, it may be the indicated component and not the PCB.
- 04
The display or the lights are flickering or showing strange behaviors, but the boiler is still functioning well.
Cause: A specific fault in the PCB affects the control and display section more than the power section, which continues to operate.
Confirm that the fault occurs consistently and is not just an occasional issue before replacing the entire PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F12 | No signal from the user interface | Yes — it points to this display/interface module or its connection cable with the main PCB. |
| F18 | User interface fault | Yes — it corresponds to this display/control board module. |
| F13 | Main PCB fault | No — that code is for the MAIN PCB (a different part), not for this display. |
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 S1072300 PCB.
- Catalogue reference
- S1072300
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
- The title published today in the catalog mentions the model 'Isofast C 35 E', which does not appear as such in the verified list of compatible boilers.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 35 E H-MOD Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB S1072300
For which boiler models is the Saunier Duval Isofast C 35 E screen Ref. S1072300 compatible?
What fault codes are documented for this display?
Is the Saunier Duval Isofast C 35 E screen Ref. S1072300 suitable for my Isofast F 30 E H-MOD boiler?
Where can I find the reference for the display?
Can this screen solve F18 fault issues in my boiler?
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