Saunier Duval ISOFAST/ISOMAX PCB (control board)
In the Saunier Duval ISOFAST and ISOMAX boilers, the Saunier Duval ISOFAST/ISOMAX PCB, reference S10400, manufactured by Myrra, is installed. This control board is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. If it fails, you will notice that the boiler does not start, locks out, or operates erratically, potentially displaying faults such as 13 or 20. It is compatible with models such as C 24 E V1, C 28 E1, and F 28 E2, among others. A technician must confirm through diagnosis whether it needs to be replaced when these symptoms are present or when any visible damage is 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. Eight confirmed compatibilities: C 24 E V1 and C 28 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 24 E V1 | ISOFAST | Contrasted |
| 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 F 28 E2 | 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 does not ignite and the display is off.
Cause: The transformer or the power supply stage of the PCB is not supplying current to the control circuits.
Measure the output of the transformer on the PCB with a multimeter before replacing it.
- 02
The display lights up but the boiler does not ignite.
Cause: The PCB starts up but does not process the demand or activate the fan or the gas valve.
Check for a real demand for heating or hot water (tap open, thermostat calling) before ruling out the PCB.
- 03
A different fault code appears every time you reset the boiler.
Cause: The PCB has an unstable internal fault that manifests randomly at each startup.
Note the codes that appear; if they change without any detectable real fault, point to the PCB.
- 04
The boiler loses its programming or settings when it completely shuts down.
Cause: The memory of the PCB does not retain data when there is a power outage, a typical symptom of a fault at that stage.
Check if the PCB has a backup battery and if it is depleted before replacing the entire board.
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
- PLCACHFC
- 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.
- Fuse
- 125 mA T, 250V
- Transformer manufacturer
- Myrra
Frequently asked questions about the PCB S1019000
Does this Saunier Duval S1019000 PCB work for the ISOFAST C 28 E1 NOX?
What brand is the transformer of this PCB for the ISOFAST F 35 E1?
What fuse does the PCB of the Saunier Duval ISOFAST use?
Spare parts related to Saunier Duval ISOFAST
