Saunier Duval Themafast NOx F 30 B 1 PCB Ref. 0020184123
When you open the hot water tap, the PCB Saunier Duval Themafast NOX F 30 B 1 Ref. 0020184123 is responsible for controlling the ignition and modulation of the burner, as well as the pump and safety features of the boiler. If this part fails, you will notice that the boiler does not start, locks out, or behaves erratically, potentially displaying the fault code F63: Main printed circuit fault. It is compatible with models from the Thema NOX range, such as the F 25 B, and Themafast NOX, such as the F 30 NL. You should replace it if you experience these issues or if the boiler does not respond properly.
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 does not light up a single LED; it is completely off when the switch is pressed.
Cause: There is a fault in the part that distributes the current to the different components.
Check that the boiler is receiving power and that the power connectors are not loose or corroded before replacing the PCB.
- 02
A lockout fault code appears and there is no way to reset it, even after cutting off the power.
Cause: The PCB detects a safety fault and does not allow ignition.
Check what specific fault code the boiler indicates; in NOX models, the lockout is usually caused by the flame sensor or the pressure switch, not always by the PCB.
- 03
The heating control is not sending anything to the boiler, as if they were not connected.
Cause: The part of the PCB that communicates with the control has stopped working.
Check that the control cable is properly connected and, if possible, test with another thermostat before replacing the PCB.
- 04
The flame ignites but goes out after a few seconds, and this repeats with each attempt.
Cause: The PCB does not maintain the signal that controls the gas valve and cuts off for safety.
First, check that the gas valve and the ionization electrode are clean: rule out those parts before blaming the PCB.
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
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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.
- Power supply
- 230V
- Low voltage output
- 24V
- The white adhesive with 'B 06' handwritten is a warehouse mark, not a technical detail of the part.
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
What voltages does this PCB from the Saunier Duval Micraplus NOX 24 handle?
Is this PCB compatible with the Saunier Duval Nox F30-NL/LL?
Does this PCB work for the Saunier Duval Thema NOX F25-B?
What connectors does this PCB from the Themafast NOX F30 have?
Spare parts related to Saunier Duval Thema NOX
