Saunier Duval Thematek F 24 E BT PCB Ref. 120404/9
The Saunier Duval Thematek F 24 E BT PCB (control board) Ref. 120404/9 controls the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler does not start, locks out, or exhibits erratic behavior, potentially displaying fault codes 11 or 13. This part is compatible with several models, including Thematek F 24 E, Thematek F 24 E BT, and Themaclassic C 24 E, among others. It is recommended to replace it if you experience issues with your boiler's operation.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 120401
PCB with reference 120401. Six confirmed compatibilities: Thematek F 24 E and Thematek F 24 E BT.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thematek F 24 E | Thematek | Contrasted |
| Saunier Duval Thematek F 24 E BT | Thematek | Contrasted |
| Saunier Duval Thematek C 24 E | Thematek | Contrasted |
| Saunier Duval Themaclassic C 24 E | Themaclassic | Contrasted |
| Saunier Duval Themaclassic F 24 E | Themaclassic | Contrasted |
| Saunier Duval Themafast F 30 E | Themafast | 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 the part number 120401 is the one 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 120401. 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 120401 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 restarts by itself and works for a while, but then it fails again.
Cause: Intermittent issues on the PCB manifest as follows: the system recovers on its own, but the problem persists.
Note how many days pass between each reset; if the interval decreases, the PCB is deteriorating and it is advisable to replace it before it fails completely.
- 02
There is no response when turning on the boiler: no display or lights.
Cause: A fault in the power supply to the PCB prevents the entire system from receiving electricity, even though the power in the house is fine.
Make sure that the power outlet works with another device and that the main switch is on before considering the PCB as faulty.
- 03
The boiler beeps or shows an error when starting, always with a different fault code.
Cause: Faults on the PCB that affect the microprocessor produce erratic readings that do not always reflect the real cause of the fault code.
Compare the code that appears with the boiler manual and first check the component it indicates (sensor, pressure switch); if that component is fine, the PCB could be the cause of the problem.
- 04
The burner or the pump do not receive the command to operate even though the boiler requests it.
Cause: This PCB controls the outputs to those components; if the relay or the output stage fails, the command is not sent.
Check if the component is receiving power at the moment it should be activated; if it is not receiving power, the lack of command comes from the PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 11 | No signal is reaching the main circuit | Main control board (PCB) fault in bus/MMI input management: the interface sends but the PCB does not receive. First, check the MMI cable/connector and 5 V on the interface; if there is continuity/voltage and the UI responds, the cause is the PCB (measure data signal on the board and, if there is no communication, replace it). |
| 13 | Main PCB fault | Internal fault of the control board PCB (microcontroller/power supply/input-output stages). Check the board voltages (+5/+12 V), inspect tracks/solder joints, and rule out shorts/sensors; if everything is correct and the error persists, the PCB is faulty and must be replaced. |
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 120401 PCB.
- Catalogue reference
- 120401
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 3 units
- 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
- Production code (label)
- 4000 120404/9 (barcode 0400712104008084351)
- Fuse
- 125mAT / USE 250V
- Correct reference
- 120404/9 — catalog published 120401 ()
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thematek C 24 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 120401
Is the PCB of the Saunier Duval Thematek F 24 E BT reference 120401 or 120404/9?
Are 120401 and 120404/9 the same part for the Thematek F 24 E BT?
How can I distinguish the IRIS1.0 735004 V087_C PCB from other similar Thematek PCBs?
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