Saunier Duval Themafast NOx F30 PCB - Ref. 0020184123 (735004 V087_C)
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Saunier Duval Themafast NOx F30 PCB - Ref. 0020184123. This control board is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. A failure of this part can generate the fault code F63: Main printed circuit board fault. It is compatible with several models, including the Thema NOX F 25 B and the Themafast NOX F 30 NL/LL, among others. It is recommended to replace it when these malfunction symptoms are detected.
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 shows no signs of life when the switch is pressed: no display or startup noise.
Cause: The transformer on this PCB powers the control part; if it fails, there is no voltage to start anything.
Check that there is power supply to the boiler and that there is no blown fuse on the PCB before replacing it.
- 02
The display lights up and seems normal, but neither the pump nor the fan nor the gas valve starts.
Cause: The driver that controls those outputs may fail, so the logic of the PCB remains active but no command reaches the actuators.
With a multimeter, check if there is voltage at the output of the component that does not start when the boiler requests heating, before replacing the PCB.
- 03
An error code appears on the display that keeps repeating even after resetting the boiler several times.
Cause: The microcontroller on the PCB monitors the sensors of the equipment and blocks operation when it detects something out of range.
Note the exact code and check the associated sensor or component before assuming that the PCB is faulty.
- 04
The boiler turns off intermittently, especially after it has been running for a while and has heated up.
Cause: The heat generated during operation can push components of the PCB that are already at their limit out of tolerance, causing intermittent cuts.
Check if the fault occurs more when the boiler is cold and just turned on or after it has been running for a while, to determine if it is 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
- 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 (silkscreen)
- 735004 V087_C
- Fuse (adhesive label)
- T 22
- Control chip
- IRIS-S2A / M74B1MB-D295P
- Relay driver chip
- Toshiba ULN2803A
- Transformer manufacturer
- Myrra
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 30 NL/LL Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 0020184123
Is this Saunier Duval Themafast NOx F30 PCB (control board) with printing 735004 V087_C compatible with my boiler?
What microcontroller is used in the PCB of the Themafast NOx F30?
Is the PECTNF30B2 PCB compatible with the Micraplus NOx 24 range?
How many models are compatible with this PCB?
What fault code is documented for this PCB?
Spare parts related to Saunier Duval Thema NOX
