Saunier Duval Isofast C 35 E1 PCB Ref. S1019000
The Saunier Duval Isofast C 35 E1 PCB (Ref. S1019000) is a component that controls the ignition, burner modulation, pump, and safety features of the boiler. If it fails, the boiler may not start, become locked, or exhibit erratic behavior. Attention should be paid to fault codes 13 and 20, which indicate problems in self-diagnosis or communication between the interface and the PCB. This board is compatible with models such as the Isofast C 28 E1, C 28 E1 NOX, and F 35 E1, among others. It is advisable to replace it when these symptoms or operational faults are detected.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S1019000
PCB with reference S1019000. 11 verified compatibilities: C 28 E1 and C 28 E1 NOX.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 28 E1 | Isofast | Contrasted |
| Saunier Duval C 28 E1 NOx | Isofast | Contrasted |
| Saunier Duval C 35 E1 | Isofast | Contrasted |
| Saunier Duval F 28 E1 | Isofast | Contrasted |
| Saunier Duval F 35 E1 | Isofast | Contrasted |
| Saunier Duval C 28 E2 | Isomax | Contrasted |
| Saunier Duval C 28 E204 | Isomax | Contrasted |
| Saunier Duval C 28 E205 | Isomax | Contrasted |
| Saunier Duval F 28 E2 | Isomax | Contrasted |
| Saunier Duval F 28 E204 | Isomax | Contrasted |
| Saunier Duval F 28 E205 | 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. S1019000 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 S1019000. 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 S1019000 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 is completely off: no pilot lights or display are turning on.
Cause: The fuse on the PCB may have blown, preventing current from reaching the circuit.
Before changing the PCB, check if the fuse is blown and measure the continuity if you have a tester.
- 02
The boiler ignites the burner, but the flame fluctuates uncontrollably, as if it is not modulating properly.
Cause: The component that controls the gas valve from the PCB could fail and lose precision in modulation.
Observe if the flame behaves erratically at different demand levels before blaming the PCB.
- 03
An error code related to the internal communication of the PCB appears.
Cause: The main control circuit could fail intermittently, generating alerts without a real external cause.
Reset the boiler and check if the fault reappears at the same point in the ignition cycle.
- 04
The control does not receive a response from the boiler even though it is properly connected.
Cause: A fault in the power regulator of the PCB could leave the communication part without stable power.
Check that the communication bus wiring has no breaks or loose connections before replacing the PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 13 | The main PCB does not pass the self-diagnosis. | The PCB (S1019000) does not pass its internal self-check. This usually occurs due to a fault in the electronics or in the EEPROM memory, or because the board does not generate the necessary internal voltages. Check that 230 V is reaching it, inspect the fuse, and measure the voltages of 5, 15, and 24 V on the board. If everything is fine and the wiring has no issues, the board needs to be replaced. |
| 20 | Communication problem between the interface and the main PCB. | There is a fault in the communication channel between the user interface and the main PCB. It could be due to incompatibility between the two, or a problem with the connectors or wiring. Check that the interface is receiving power from the PCB, inspect the connectors and wiring, and test with an interface that you know works. If the problem persists, the cause is the PCB. |
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 S1019000 PCB.
- Catalogue reference
- S1019000
- 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.
- Supply voltage
- 230V
- Fuse
- FUSE 125mAT 250V
- Factory internal code (physical PCB)
- 116010 G / SOK 01 33
- Integrated driver code
- ULN2803A
- Main integrated circuit
- SDA1586E 080101
- Secondary integrated circuit
- LM3748IM8-313SP 113100
- Manufacturer
- Saunier Duval
- Compatibility OEM ref. S1019000
- Saunier Duval Isofast C35E1 (and C28E1, F28E2, F35E1, Isomax C28E2/F28E2)
Frequently asked questions about the PCB S1019000
Is this PCB Ref. S1019000 suitable for a Saunier Duval Isofast C 35 E1?
What components are mounted on the S1019000 PCB?
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