Honeywell Control PCB Ferroli Econcept Tech 25 C Ref. S4962V2001
The Honeywell Ferroli Econcept Tech 25 C Control PCB is the component that manages the ignition, burner modulation, pump, and safety features of the boiler. When it malfunctions, the boiler may fail to start, become locked, or exhibit erratic behavior. The fault codes A23, A24, A26, A61, or A63 may appear, indicating issues with the configuration or the controller. This PCB is compatible with the models Econcept Tech 25C, 35C, Micro 25C, Micro 35C, and Domicompact F24, among others. A technician must confirm through diagnosis whether it needs to be replaced when these symptoms or fault codes are detected.
Ferroli boilers compatible with reference 39821523
PCB with reference 39821523. Five confirmed compatibilities: Econcept Tech 25C and Econcept Tech 35C.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ferroli Econcept Tech 25C | Econcept Tech | Contrasted |
| Ferroli Econcept Tech 35C | Econcept Tech | Contrasted |
| Ferroli Econcept Tech Micro 25C | Econcept Tech | Contrasted |
| Ferroli Econcept Tech Micro 35C | Econcept Tech | Contrasted |
| Ferroli Domicompact F24 | Domicompact | 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. 39821523 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 39821523. 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 39821523
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 respond at all: no display, no lights, no noise when turning it on.
Cause: The PCB distributes power to the entire electronic system; if its input block fails, no power reaches anything else.
Before replacing it, check that there is voltage at the boiler's socket and that the fuse for the PCB is not blown.
- 02
An error code appears on the display that keeps repeating even after you reset the boiler several times.
Cause: The PCB processes the readings from the boiler sensors and locks the unit when any of them goes out of range.
Check the exact code in the manual before replacing the PCB: many codes indicate a specific sensor, not the control electronics.
- 03
The heating works well, but the domestic hot water comes out cold or lukewarm, or vice versa.
Cause: The PCB manages the priority between heating and domestic hot water by activating the corresponding components; if that logic fails, a circuit remains unattended.
Before changing the PCB, check the water flow and the condition of the heat exchanger or the flow sensor, as they can also cause this symptom.
- 04
The remote control is unable to change the temperature or the mode of the boiler, although the remote itself seems to be functioning.
Cause: The commands from the control unit reach the boiler through the PCB; if its communication stage fails, the control becomes ineffective.
Test the manual operation of the boiler, if possible, to rule out that the fault is in the control or its wiring before replacing the PCB.
- 05
The boiler starts but stops on its own after a few minutes, repeatedly.
Cause: The PCB monitors safety signals in real time and interrupts the cycle as soon as it detects something out of range, whether it's a real fault or a reading error.
Check that the temperature sensors and the pressure switch of the boiler are clean and properly connected, so you don't replace the PCB unnecessarily.
Ferroli fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| A23 | Anomaly in the control board parameters (misconfigured/corrupt PCB parameter). | The control board itself loses or corrupts its factory internal parameters, so the board is the documented cause; it is verified by re-entering/checking the board parameter, and if it reappears after reconfiguring, a technician must confirm whether it is necessary to replace the board. |
| A24 | Anomaly in the control board parameters (misconfigured/corrupt PCB parameter). | Same family as A23: the main PCB does not validate its own internal parameters; the board parameter is checked/reconfigured and, if it persists, the PCB is the part to be replaced. |
| A26 | Anomaly in the control board parameters (misconfigured/corrupt PCB parameter). | Indicate incorrect internal configuration/parameter of the PCB; the PCB is the component involved. The board parameter is checked, and if it is not resolved by reconfiguring, the PCB is replaced. |
| A61 | ABM03 controller fault (internal error of the control unit/main PCB). | It is an internal error of the control electronics itself (ABM03 PCB), not of an external sensor; the grounding is checked, and if it reappears, the documented solution is to replace the PCB/controller. |
| A63 | ABM03 controller fault (internal error of the control unit/main PCB). | 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. |
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 Ferroli PCB 39821523
- Catalogue reference
- 39821523
- Uniclima internal SKU
- PECFET0501X
- Brand
- Ferroli
- 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.
- Manufacturer
- Honeywell
- Code
- S4962V2001
- Base model of the PCB
- DBM04C
- Software version
- R256F
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Ferroli Econcept Tech Micro 35C Manual (PDF)Document © Ferroli, provided as a technical reference.
Frequently asked questions about the PCB 39821523
Which manufacturer has the PCB for the Ferroli Econcept Tech 25 C?
What is the S4962V2001 code of this PCB?
Which models is this PCB compatible with?
What fault codes are documented for this PCB?
What is the reference for this control PCB?
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