Electronic Display Boiler Saunier Duval ThemaFast Condens / Glow-worm Ultracom 2
The electronic display of the Saunier Duval ThemaFast Condens / Glow-worm Ultracom 2 boiler is a control PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When this part fails, the boiler may not start, become locked, or exhibit erratic operation, displaying the fault code F.70. It is compatible with several models, including Thema Condens AS 25 A, ThemaPlus Condens 25-A, and ThemaFast Condens 30 A, among others. It is recommended to replace the electronic display when these malfunction symptoms occur.
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Consult via WhatsAppSaunier Duval boilers compatible with reference 0020191787
PCB with reference 0020191787. Eight confirmed compatibilities: Thema Condens AS 25 A and Thema Condens AS 12 A.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thema Condens AS 25 A | Thema Condens AS | Contrasted |
| Saunier Duval Thema Condens AS 12 A | Thema Condens AS | Contrasted |
| Saunier Duval ThemaPlus Condens 25-A | ThemaPlus Condens | Contrasted |
| Saunier Duval Themaplus Condens 30 A | ThemaPlus Condens | Contrasted |
| Saunier Duval Themaplus Condens 35 A | ThemaPlus Condens | Contrasted |
| Saunier Duval ThemaFast Condens 25 A | ThemaFast Condens | Contrasted |
| Saunier Duval ThemaFast Condens 30 A | ThemaFast Condens | Contrasted |
| Saunier Duval ThemaFast Condens 35 A | ThemaFast Condens | 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 reference 0020191787 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 0020191787. 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 0020191787 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 control does not turn on in any of the boilers where this display is installed, not even with a flicker.
Cause: If it doesn't turn on, it is usually because it is not receiving power from the main PCB or because the module is damaged.
Check with the boiler open that the connector from the control to the main PCB is properly fitted and without signs of moisture or rust.
- 02
The display does not show the parameters or the temperature, although the boiler continues to heat normally.
Cause: It can fail independently of the rest of the combustion system.
Check that the heating or the hot water are still working with the previous setting; if so, the fault is in the control.
- 03
It does not respond to the buttons even though the screen appears normal.
Cause: The keyboard may fail without the display failing.
Test each button separately and note if any respond intermittently before deciding that it is the complete module.
- 04
The screen looks fine for a while and then turns off by itself, especially when moving or lightly tapping the front panel.
Cause: It is a symptom of a flat cable or connector with poor contact between the control and the PCB.
With the boiler unplugged, check the internal connector, clean it if there is rust, and reconnect it before purchasing the part.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.70 | Invalid product code (DSN). | The display module can cause this error when both the screen and the PCB are replaced simultaneously without readjusting the product code (DSN); check by entering the diagnostic menu and reprogramming the DSN or fitting the correct screen/PCB combination. |
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 0020191787
- Catalogue reference
- 0020191787
- 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
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval ThemaFast Condens 35 A Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 0020191787
Is this DECTC2812 electronic display compatible with my Saunier Duval ThemaFast Condens 30 A boiler?
Which Glow-worm models are compatible with the DECTC2812 display?
Does the DECTC2812 display work for the ThemaPlus Condens range?
How many models are compatible with the DECTC2812 electronic display?
What documented fault code is related to this screen?
Spare parts related to Saunier Duval ThemaPlus Condens
