Saunier Duval Isomax PCB F28 E2 Ref. S1019000
Electronic board listed for Saunier Duval Isomax F28 E2, catalog reference S1019000. LACROIX POLAND identifies the photographed transformer; SOFREL appears on the board. Confirm the exact reference and revision before buying: these markings alone do not establish compatibility.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- S1019000
- Warranty
- 1 year
Check the model and version before ordering
We retain associated models to help you find your appliance. The version and parts diagram must be checked before choosing this replacement.
Models pending verification
These models are associated with this reference, but we have not finished verifying them yet, so we do not consider them compatibleIf your boiler is one of them, send us a photo of the part you are going to replace and we will verify it before you purchase.
| Saunier Duval C 28 E1 | Isofast | Unconfirmed |
|---|---|---|
| Saunier Duval C 28 E1 NOx | Isofast | Unconfirmed |
| Saunier Duval C 35 E1 | Isofast | Unconfirmed |
| Saunier Duval F 28 E1 | Isofast | Unconfirmed |
| Saunier Duval F 35 E1 | Isofast | Unconfirmed |
| Saunier Duval C 28 E2 | Isomax | Unconfirmed |
| Saunier Duval C 28 E204 | Isomax | Unconfirmed |
| Saunier Duval C 28 E205 | Isomax | Unconfirmed |
| Saunier Duval F 28 E2 | Isomax | Unconfirmed |
| Saunier Duval F 28 E204 | Isomax | Unconfirmed |
| Saunier Duval F 28 E205 | Isomax | Unconfirmed |
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 turn on: there are no lights or sounds when power is supplied.
Cause: If the microprocessor or the power supply stage of the PCB is damaged, the start command is not sent to the components.
Check if there is power to the boiler and make sure that the main fuse is not blown before replacing the PCB.
- 02
The display shows a fixed fault code that does not clear after resetting the boiler.
Cause: The PCB blocks operation when it detects an internal fault or an external sensor fault and does not unlock automatically.
Note the exact code and first rule out the NTC sensor, the pressure switch, or the flame electrode according to what that code indicates.
- 03
The boiler turns on by itself, without a demand for heating or domestic hot water.
Cause: A relay on the PCB that does not open correctly can keep the gas valve or the pump active without a real command.
Disconnect the room thermostat and check if the boiler continues to turn on by itself before replacing the PCB.
- 04
The remote control or the control panel do not respond to the presses.
Cause: The PCB manages communication with the control; if that circuit fails, it does not receive or process commands.
Check that the communication bus wiring is properly connected and free of corrosion before considering that the PCB is damaged.
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
- CECIF28E2
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 7 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.
- Brand visible on the transformer
- LACROIX POLAND
- Marking on the board
- SOFREL
- The batch code 116844 4 / 50K 06 16 is not the purchase reference: it is a traceability code distinct from the catalog reference S1019000, and it does not contradict it.
Frequently asked questions about the PCB S1019000
What does the LACROIX POLAND brand in the photo identify?
Where are the SOFREL marking and the white label?
How can I confirm that this board fits my boiler?
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