Saunier Duval Isofast F 35 E H MOD Display Ref. S1072300
The Saunier Duval Isofast F 35 E H MOD display is a control PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, may lock out, or may exhibit erratic behavior. Users may notice issues such as fault codes F12, F18, or F13. This part is compatible with several models from the Isofast Condens, Isofast, and Isomax ranges, among others. It is recommended to replace it when experiencing these symptoms.
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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 starts the combustion but the pump never runs, neither in heating nor in domestic hot water.
Cause: The PCB sends the electrical signal to the pump; if the corresponding relay is stuck or burned out, the pump never receives power.
Before changing the PCB, check with a tester if there is voltage at the pump connector when the boiler requests circulation.
- 02
The remote control or the modulating thermostat is not communicating with the boiler: disconnection appears or there is no response.
Cause: The PCB has the communication module with the remote control; a fault there interrupts the dialogue even if the rest of the boiler is functioning.
Try to resynchronize the remote control and check the bus wiring before declaring the PCB faulty.
- 03
It triggers a fault code for overheating or flame failure that does not match what is observed in the boiler.
Cause: The PCB interprets the signals from the sensors; if its reading stage fails, it generates errors that do not correspond to the actual state.
Cross-check the code with the boiler manual and first rule out the sensor or the electrode that indicates the fault.
- 04
The boiler resets itself or suddenly restarts without anyone having touched anything.
Cause: A power failure on the PCB causes spontaneous reboots of the microprocessor.
Check if the reset coincides with peaks in consumption from other devices in the home's electrical system.
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 'Isofast F 35 E H MOD'; the verified list of compatible boilers only includes 'ISOFAST F 35 E H' and 'ISOSPLIT F 35 E H-MOD' separately, not that exact combination.
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
Does this PCB fit the Isofast F 30 EH?
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