Saunier Duval PCB Isofast/Isomax/Isosplit - Ref. S1072300
The PCB controls the ignition, the modulation of the burner, the pump, and the safety features of the boiler. If it fails, the boiler may not start, lock out, or behave erratically, displaying faults such as F12, F18, or F13. This board is compatible with models from the Isofast, Isomax, and Isosplit ranges, including among others the F 30 E H-MOD and the F 35 E. It is recommended to replace it when it shows operational faults or errors in the system.
VAT included
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 won't start, no lights or display turn on, as if it's not receiving power.
Cause: If the PCB fails, it does not supply power to the other components and the boiler does not respond.
First, check the fuse on the PCB and verify that there is mains voltage before considering the board as faulty.
- 02
The display or the control shows a fault code that does not clear even after resetting the boiler.
Cause: The control electronics detect an internal fault and display it on the screen until the damaged component is replaced.
Note the exact code and consult it in your model's manual: some codes indicate problems with sensors or pressure switches, not with the PCB.
- 03
The boiler turns on but does not respond to the thermostat or the programmer commands.
Cause: If the microprocessor on the PCB is damaged, it does not properly manage the signals from the peripherals.
Try bypassing or replacing the thermostat or the programmer to rule out that the fault is coming from there and not from the PCB.
- 04
When opening the boiler, there is a burning smell or darkened areas can be seen in the circuit.
Cause: An electronic component (fuse, relay, capacitor) can burn out due to overvoltage or humidity, rendering the PCB unusable.
Visually inspect the PCB with the boiler unplugged: if you don't see burn marks, the fault may be elsewhere.
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
- 1-2 business days
- Return
- 14 days
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
Is this PCB suitable for my Isosplit Condens F 35 E boiler?
Is the reference S1072300 verified against the physical PCB?
Does this same PCB S1072300 work for the Isofast F 30 EH and the Isomax F 35 E?
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