
Bertelli & Partners Ferroli Fersystem Tech 25C PCB Ref. 39828240
The control PCB from Bertelli & Partners for the Ferroli Fersystem Tech 25C boiler manages the ignition, burner modulation, pump, and system safety features. When it fails, the boiler may not start, lock out, or exhibit erratic behavior, potentially displaying the fault code A02: Flame signal present with burner off. This model is compatible with several boilers in the Fersystem Tech range, such as the Fersystem Tech 10A and the Fersystem Tech 35C, among others. It is recommended to replace it if you experience starting issues or unstable operation.
VAT included
Consult via WhatsAppFerroli boilers compatible with reference 39828240
PCB with reference 39828240. Ten verified compatibilities: Fersystem Tech 10A and Fersystem Tech 18A.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ferroli Fersystem Tech 10A | Fersystem Tech | Contrasted |
| Ferroli Fersystem Tech 18A | Fersystem Tech | Contrasted |
| Ferroli Fersystem Tech 25A | Fersystem Tech | Contrasted |
| Ferroli Fersystem Tech 25C | Fersystem Tech | Contrasted |
| Ferroli Fersystem Tech 35A | Fersystem Tech | Contrasted |
| Ferroli Fersystem Tech 35C | Fersystem Tech | Contrasted |
| Ferroli Fersystem Box 25C | Fersystem Box | Contrasted |
| Ferroli Fertech 18 OV | Fertech | Contrasted |
| Ferroli Fertech 31C | Fertech | Contrasted |
| Ferroli Fertech 38C | Fertech | 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. 39828240 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 39828240. 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 39828240 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 not responding at all, neither the indicators nor the display, as if it had no power.
Cause: The PCB controls the entire system; if it fails, the unit will not start even if it receives power.
Before changing it, check the fuse on the PCB and make sure that the main switch and the differential are functioning properly.
- 02
It locks with a fault code and the reset doesn't solve it, or it triggers again immediately.
Cause: If the safety circuit of the PCB is damaged, it cannot maintain the correct state after the reset.
Try the reset two or three times spaced out over time: if the fault reappears the same and quickly, suspect the PCB.
- 03
The programmable thermostat indicates a heating demand, but the boiler does not turn on.
Cause: The PCB receives that demand and activates the ignition; if the input circuit fails, the command is lost.
Check the thermostat connection terminals on the PCB to ensure they are neither loose nor corroded before discarding it.
- 04
The circulation pump does not start when the boiler should be heating.
Cause: The PCB sends the electrical signal to the pump; if the relay fails, the pump is left without power.
Measure with a tester if there is voltage reaching the pump at the moment it should activate, before changing the PCB.
Fault codes for Ferroli that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| A02 | Flame signal present with burner off | The control board (PCB) may give a false ionisation reading (parasitic currents/erroneous reading), causing the boiler to detect a flame with the burner off. First, check the electrode and wiring; if the issue persists, measure the ionisation signal at the PCB input or test/replace the board. |
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.
Ferroli PCB data 39828240
- Catalogue reference
- 39828240
- Brand
- Ferroli
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Component manufacturer
- Bertelli & Partners
- Component code
- DBM14A
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Ferroli Fersystem Tech 25A Manual (PDF)Document © Ferroli, provided as a technical reference.



