Thermowatt PCB Ariston Genus 23 Rffi
The Thermowatt PCB Ariston Genus 23 Rffi, with reference S1047000, is the control unit that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or exhibit erratic operation. This part is compatible with several models, including the Genus 23 R FFI, Genus 23 S FFI, Genus 27 R FFI, and Codex 23 FFI, among others. It is recommended to replace it if you observe faults such as 301, 302, 303, 305, or 306.
VAT included
Consult via WhatsAppAriston boilers compatible with reference 952975
PCB with reference 952975. 11 verified compatibilities: Genus 23 R FFI and Genus 23 S FFI.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ariston Genus 23 R FFI | Genus (FFI) | Contrasted |
| Ariston Genus 23 S FFI | Genus (FFI) | Contrasted |
| Ariston Genus 23 N FFI | Genus (FFI) | Contrasted |
| Ariston Genus 27 R FFI | Genus (FFI) | Contrasted |
| Ariston Genus 27 S FFI | Genus (FFI) | Contrasted |
| Ariston Genus 27 N FFI | Genus (FFI) | Contrasted |
| Ariston Codex 23 FFI | Codex (FFI) | Contrasted |
| Ariston Codex 27 FFI | Codex (FFI) | Contrasted |
| Ariston ES 23 FFI | ES (FFI) | Contrasted |
| Ariston EuroCombi A23 MFFI | EuroCombi (MFFI) | Contrasted |
| Ariston EuroCombi A27 MFFI | EuroCombi (MFFI) | 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. 952975 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 952975. 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 952975 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 does not start at all: no lights, no display, no noise from any component.
Cause: The PCB is not receiving power or does not have operational control logic, so it cannot give commands to the rest of the equipment.
Check the fuse on the PCB and the power supply before replacing it.
- 02
The burner ignites normally, but the flame appears unstable, fluctuating, and sometimes goes out on its own.
Cause: If the PCB does not properly modulate the signal to the gas valve, it can cause irregular combustion.
Check the gas pressure and the condition of the valve first, to avoid attributing a fault to the PCB that belongs to another part.
- 03
The relays are not responding: the pump, fan, or ignition do not activate despite a heat demand.
Cause: A burned relay or a damaged trace on the PCB prevents commands from being sent to those components.
With the boiler unplugged, check for burnt components or dark marks on the PCB before replacing it.
- 04
A different fault code appears every few days, without any change in the use of the boiler.
Cause: An internal fault in the PCB can trigger different protections depending on which circuit fails at any given moment.
Write down all the codes you see in a week before deciding that the problem is the PCB.
Fault codes for Ariston that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 301 | EEPROM error (PCB memory). | The auxiliary PCB EI A‑FFI/P (Ref. 952975) shows corruption or invalid reading of the EEPROM; check 5/12 V voltages and, if the fault persists after reset, replace the PCB. |
| 302 | Communication error (internal bus/between PCBs). | The EI A‑FFI/P (952975) loses internal communication between microcontrollers or with the interface; check connectors/wiring and stable power supply, and if it continues, replace the PCB. |
| 303 | Main PCB fault. | Internal fault of the EI A‑FFI/P (952975); after ruling out sensors/actuators and confirming 230 V and low voltages are correct, the recommended repair is to replace the PCB. |
| 305 | Main PCB fault. | Internal electronic fault in the EI A‑FFI/P (952975); if it reappears after reset and basic electrical checks, replace the PCB. |
| 306 | Main PCB fault. | Hardware anomaly in the EI A-FFI/P (952975) detected by self-diagnosis; confirm power supply/wiring and, if it persists, replace the PCB. |
| 307 | Main PCB fault. | Critical fault of the EI A‑FFI/P (952975) confirmed by the system; after basic tests, the usual action is to replace 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 Ariston PCB 952975
- Catalogue reference
- 952975
- Brand
- Ariston
- 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.
- PCB manufacturer
- Thermowatt
- Main chip marking (central digits uncertain)
- AMS ...TN-1C1E-87
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Ariston Genus 23 S FFI Manual (PDF)Document © Ariston, provided as a technical reference.
Frequently asked questions about the PCB 952975
Is this Thermowatt PCB suitable for an Ariston Genus 23 RFFI?
Who manufactures the PCB with reference 952975 for the Ariston Genus 23 RFFI?
Is this PCB suitable for an Ariston ES HP 30 MCSI?
