Saunier Duval Isofast Condens F30E Lacroix PCB Ref. S1040000
The Saunier Duval Isofast Condens F30E PCB, manufactured by Lacroix and with reference S1040000, is the component responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or operate erratically, which can lead to fault codes such as F.70, F.63, or F.64. This PCB is compatible with models from the Isofast Condens, Isomax Condens, and Isotwin Condens ranges, among others. It is recommended to replace it when these symptoms or performance faults occur.
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Consult via WhatsAppSaunier Duval boilers compatible with reference S1040000
PCB with reference S1040000. Four 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 35 E | Isomax Condens | Contrasted |
| Saunier Duval F 30 E | Isotwin Condens | 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. S1040000 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 S1040000. 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 S1040000 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 the display is off.
Cause: The main control board manages all the electronics of the boiler; without it, nothing starts.
Check that the boiler is receiving power and that the input fuse of the PCB is in good condition before replacing it.
- 02
The display shows an electrical fault code that is not resolved by turning the boiler off and on.
Cause: The PCB blocks operation when it detects an out-of-range signal in any of the components it monitors.
Note the code and check its description in the boiler manual: it may be related to a sensor or a peripheral, not with the PCB.
- 03
The boiler intermittently stops responding to the controls or the thermostat.
Cause: An internal continuity fault on the PCB can cause it to lose communication with the rest of the system without warning.
Check the wiring and connectors of the PCB, ensuring that they are not loose or corroded, before replacing it.
- 04
The boiler operates erratically: it stops on its own or changes mode without intervention.
Cause: This PCB centralizes all the operating logic of the boiler; an internal fault causes inconsistent behaviors.
Record when the fault occurs (startup, heating, domestic hot water) to rule out that it is a specific component and not the entire PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.70 | Invalid product code (DSN). | Joint replacement of screen and PCB (S1040000) without reprogramming the DSN or incorrect power/gas coding resistor on the PCB; check in service menu (e.g., d.93), review/code resistor and recode DSN. |
| F.63 | EEPROM fault. | Memory/electronic fault in the PCB (S1040000); confirm after reset and checking voltages/grounds; if it persists, reprogram or replace the PCB. |
| F.64 | Fault in the electronics / NTC. | The analog front-end/ADC of the PCB detects a short circuit/impossible readings from the NTC or is faulty; isolate by disconnecting/measuring the NTC and wiring, and if they are correct, replace the PCB. |
| F.65 | Fault: electronics temperature. | Overheating of the PCB; check for external heat sources/ventilation and actual temperature on electronics; if it reappears without an external cause, replace the PCB. |
| F.67 | Fault: electronics/flame. | The flame control ASIC on the PCB delivers an implausible signal; measure ionisation current and ground, and if they are correct, the electronics (S1040000) are faulty. |
| F.42 | Resistance fault coded (probably in combination with F.70). | Gas type coding resistor on the PCB short-circuited/open or incorrectly coded; check value and connections (and those of the power harness) and recode/replace the board if the integrated resistor fails. |
| F.27 | Safety shutdown: incorrect flame detection. | Moisture/damage in the flame control electronics of the PCB causes out-of-phase flame detection; inspect/retighten seals, dry and check the board and ionization signal before replacing it. |
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 S1040000 PCB.
- Catalogue reference
- S1040000
- 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
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Control platform
- SYMSI7.0
- Silkscreened code on PCB
- 0310144400S20
- Traceability
- 902319 / 0020021129 / 443953 / 003981T2 / KWD / IND19 / C0096
- PCB flammability marking
- GF201 94V-0 (GF P/N 2036288E 2)
- Supply voltage
- 230V
- Relay 1
- OMRON G5Q-1A-VH, 24VDC (China, batch 1692C5)
- Relay 2 (reading with variation between photographs)
- SCHRACK / TE Connectivity RY511024 or RY611024, 24VDC
- The actual manufacturer is Lacroix, not Saunier Duval; the boiler brand indicates compatibility, not the component manufacturer.
Frequently asked questions about the PCB S1040000
Who manufactures the PCB of the Saunier Duval Isofast Condens F30E?
Which models are compatible with the Lacroix PCB Ref. S1040000?
When should I replace the PCB in an Isofast Condens F30E?
What fault codes are documented for this PCB?
What is the reference for the PCB for the Saunier Duval Isofast Condens F30E?
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