Saunier Duval Thema NOx F25-B PCB Ref. 0020165023
The Saunier Duval Thema NOx F25-B PCB, with reference 0020165023, is a crucial component in the control of the boiler. This board is responsible for managing the ignition, burner modulation, pump, and safety features of the equipment. When it fails, the boiler may not start, become locked, or behave erratically, potentially displaying the fault code F63: Main printed circuit fault. It is compatible with models such as F 25 B, F 25 B/2, and F 25 A LPG/GN, among others. It is recommended to replace it when these issues are detected in the boiler's operation.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 0020184123
PCB with reference 0020184123. Six confirmed compatibilities: F 25 B and F 25 B/2.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 25 B | NOX Thema | Contrasted |
| Saunier Duval F 25 B/2 | NOX Thema | Contrasted |
| Saunier Duval F 25 B GN/BP | NOX Thema | Contrasted |
| Saunier Duval F 25 A LPG/GN | Themafast NOX | Contrasted |
| Saunier Duval F 30 NL/LL | Themafast NOX | Contrasted |
| Saunier Duval 24 B2 | Micraplus NOX | 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. 0020184123 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 0020184123. If it is not visible, do not identify the part by 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 0020184123 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 tries to ignite several times in a row and ends up locking out due to an ignition fault.
Cause: The PCB is not sending the spark and gas opening command at the correct moment, which causes the ignition sequence to fail.
Check the ignition electrode and the condition of the burner; if they are fine, the failed sequence points to the PCB.
- 02
The boiler stops and the lock indicator lights up without anything unusual happening in the installation.
Cause: An internal fault in the PCB can trigger the lockout protection even if there is no actual gas or flame issue.
Reset once and note if it repeats exactly at the same point in the cycle; if so, it is more likely to be the PCB.
- 03
The boiler works well for a few days and then starts to show faults for no clear reason, intermittently.
Cause: The internal components of the PCB degrade with use and heat, leading to intermittent faults before failing completely.
Keep a record of when the fault occurs (cold start, after many hours of use) before deciding on the replacement.
- 04
The fan or the pump does not start when the boiler requests heat.
Cause: The PCB is the one that gives the electrical command to these components, and if its output fails, they do not receive current even if they are in good condition.
Measure with the multimeter if power is reaching the pump or the fan directly from the PCB before replacing it.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F63 | Main PCB fault | The EEPROM/electronics of the main board is damaged or corrupted, causing the equipment to lock. Check the board voltages, connections, and if the issue persists, replace/reprogram the PCB 0020184123. |
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 PCB 0020184123
- Catalogue reference
- 0020184123
- Brand
- Saunier Duval
- 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 code
- 0020165023
- Secondary code
- 0010000258
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 25 B/2 Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 0020184123
Does this PCB fit the Saunier Duval Micraplus NOx 24?
What secondary code is on the label of the Thema NOx F25-B PCB?
Does this PCB work for the Saunier Duval Themafast NOx F30?
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