Saunier Duval PCB Thema/Isotwin/Isosplit/Thematek
The Saunier Duval Thema/Isotwin/Isosplit/Thematek PCB controls the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or operate erratically. This component is compatible with several models, including Thema, Isotwin, and Isosplit. The confirmed manufacturer reference is S10470 and the firmware is labeled as SYMSI7.0. A technician must confirm through diagnosis whether it needs to be replaced when these symptoms occur, in order to restore the normal operation of your boiler.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- internal SKU
- PLCC24FF
- Warranty
- 1 year
How to check if it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference —. 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 that require diagnosis on the PCB
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: no display or fan noise.
Cause: The PCB is responsible for receiving the electrical supply so that the other components can function.
Check the fuse on the PCB and make sure the boiler is receiving stable power from the grid before replacing it.
- 02
A fault code remains displayed on the screen that does not clear when resetting.
Cause: The PCB keeps the fault as a safety measure until it verifies that the real cause has been resolved.
Identify the code in the manual: if it indicates an external sensor, check that component before replacing the PCB.
- 03
The burner ignites normally, but the flame appears unstable, rising and falling without reason.
Cause: The PCB adjusts the flame according to the demand, and a fault in this function causes that fluctuation.
First, rule out the inlet gas pressure and the condition of the electrode, as they can produce a similar symptom.
- 04
The boiler works but loses communication with the thermostat or the control unit frequently.
Cause: The communication bus with the external regulator goes through the PCB, and an intermittent fault here cuts the signal.
Check the wiring and the bus terminals on the PCB before considering it faulty.
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.
Saunier Duval PCB data sheet
- Uniclima internal SKU
- PLCC24FF
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- firmware code/printed name
- SYMSI7.0
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thema/Isotwin/Isosplit/Thematek Electronic Manual (PDF) Document ©, provided as a technical reference.
Frequently asked questions about the PCB (control board)
What code is printed on this PCB from Saunier Duval Thema/Isotwin/Isosplit/Thematek?
Is this PCB PLCC24FF compatible with any model of Saunier Duval?
Which manufacturer produces the PCB PLCC24FF?
What should I do if my boiler has faults and I need a PCB?
Where can I find more information about the PCB PLCC24FF?
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