Saunier Duval Isofast C 35 E1 PCB Ref. S1019000
The Saunier Duval Isofast C 35 E1 PCB (control board) 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 board. This board is compatible with models such as the Isofast C 28 E1, C 28 E1 NOX, and F 35 E1, among others. A technician must confirm through diagnosis whether it needs to be replaced when these symptoms or faults in operation are detected.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- S1019000
- Warranty
- 1 year
Saunier Duval boilers compatible with reference S1019000
PCB with reference S1019000. 11 verified compatibilities: C 28 E1 and C 28 E1 NOX.
Verified compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 28 E1 | Isofast | Verified |
| Saunier Duval C 28 E1 NOx | Isofast | Verified |
| Saunier Duval C 35 E1 | Isofast | Verified |
| Saunier Duval F 28 E1 | Isofast | Verified |
| Saunier Duval F 35 E1 | Isofast | Verified |
| Saunier Duval C 28 E2 | Isomax | Verified |
| Saunier Duval C 28 E204 | Isomax | Verified |
| Saunier Duval C 28 E205 | Isomax | Verified |
| Saunier Duval F 28 E2 | Isomax | Verified |
| Saunier Duval F 28 E204 | Isomax | Verified |
| Saunier Duval F 28 E205 | Isomax | Verified |
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
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- 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 that require diagnosis on the PCB S1019000
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 Saunier Duval that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 13 | The main PCB does not pass the self-diagnosis. | This symptom may be related to the part, but it does not confirm that it is faulty. A technician must check the equipment and its inspection according to the manual before deciding on a repair or replacement. |
| 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
- Uniclima internal SKU
- PLCASTC35
- 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
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- 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?
Spare parts related to Saunier Duval Isomax
