Saunier Duval Isofast F35 E1 PCB Ref. S1019000
The control PCB manages the ignition, burner modulation, pump, and safety features of the boiler. This part, from Myrra and with reference S1019000, is essential for the operation of models such as the Isofast C 28 E1 and F 35 E1, among others. When it fails, the boiler may not start, become locked, or exhibit erratic behavior, which can manifest in fault codes 13 or 20. A technician must confirm through diagnosis whether it is necessary to replace the PCB when these symptoms or operational faults 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.
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
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 tries to ignite, a clicking sound is heard but the flame does not light.
Cause: The ignition transformer on the PCB does not generate the necessary spark, and the control unit aborts the cycle.
Check that the ignition electrode is clean and properly positioned, and that the high voltage cable is not damaged.
- 02
The PCB gives no signal: no lights, no display, no startup noise.
Cause: An internal fault in the control electronics prevents the PCB from receiving or processing the 230V power supply.
Measure with a multimeter that there is voltage at the input terminals of the PCB before declaring it faulty.
- 03
The boiler repeatedly locks out as soon as you try to ignite it.
Cause: The PCB detects that the ignition has not occurred correctly and cuts off the cycle for safety after several attempts.
Check the condition of the ionization electrode and the ground connection of the boiler before replacing the PCB.
Fault codes Saunier Duval that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 13 | Main printed circuit board fault. | The main PCB (S1019000) does not pass the internal self-diagnosis; this is usually due to an electronics/EEPROM fault or the PCB not generating its internal voltages. Check the 230 V input, fuse, and low voltages (5/15/24 V) on the PCB; if these are correct and the wiring is OK, replace the PCB. |
| 20 | Communication fault between the user interface and the main PCB. | Communication channel/ebus fault on the main board, incompatibility between interface and PCB or defective connection/harness. Check the interface power supply from the board, connectors/harness and test with a known interface; if it 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
- PLCISF35E1
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 5 units
- 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
- Ignition transformer - manufacturer
- Myrra
- Ignition transformer - model
- LA1701X (Poland)
Frequently asked questions about the PCB S1019000
Does this PCB Ref. S1019000 fit the Saunier Duval Isofast C28, C35, F28, and F35 E1?
What voltage does the PCB of the Isofast F35 E1 operate at?
What ignition transformer is installed on this PCB of the Isofast F35 E1?
When should this PCB be replaced in an Isofast or Isomax?
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