Saunier Duval Isofast F 28 E1 Control Panel Ref. 05721000
The Saunier Duval Isofast F 28 E1 Control Panel is a PCB that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the user may notice that the boiler does not start, locks out, or exhibits erratic operation, potentially displaying fault codes F12, F18, or F13. This panel is compatible with several boilers in the Isofast range, such as the C 28 E, C 28 E1, F 28 E, and F 35 E models, among others. It is recommended to replace it when any of the mentioned symptoms occur.
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Consult via WhatsAppSaunier Duval boilers compatible with reference 05721000
PCB with reference 05721000. 14 verified compatibilities: C 28 E and C 28 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 28 E | Isofast | Contrasted |
| Saunier Duval C 28 E1 | Isofast | Contrasted |
| Saunier Duval C 28 E NOx | Isofast | Contrasted |
| Saunier Duval C 28 E1 NOx | Isofast | Contrasted |
| Saunier Duval C 35 E | Isofast | Contrasted |
| Saunier Duval C 35 E1 | Isofast | Contrasted |
| Saunier Duval F 28 E | Isofast | Contrasted |
| Saunier Duval F 28 E1 | Isofast | Contrasted |
| Saunier Duval F 35 E | Isofast | Contrasted |
| Saunier Duval F 35 E1 | Isofast | Contrasted |
| Saunier Duval C 28 E | Isomax | Contrasted |
| Saunier Duval C 28 E2 | Isomax | Contrasted |
| Saunier Duval F 28 E | Isomax | Contrasted |
| Saunier Duval F 28 E2 | Isomax | 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. 05721000 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 05721000. 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 05721000 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 panel screen is off or blank even though the boiler is working.
Cause: The control panel has its own display electronics and can fail even if the main PCB is functioning properly.
Check the 5-pin connector that connects it to the boiler and make sure it is properly seated before replacing it.
- 02
The buttons do not respond or respond intermittently when pressed.
Cause: The integrated keyboard on the panel loses contact or wears out with use.
Clean the area around the buttons and try pressing with different intensities before replacing the panel.
- 03
Strange symbols, flickering, or cut-off information appear on the screen.
Cause: A fault in the panel's electronics alters what is displayed even though the boiler continues to operate.
Reset the boiler by cutting the power for a couple of minutes before declaring the control board faulty.
- 04
The temperature settings cannot be changed nor can schedules be programmed from the panel.
Cause: The control panel is the one that translates those commands to the main PCB, and if it fails, those settings are lost.
Check if the fault recurs after a reset or if it only occurs in a specific menu before replacing it.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F12 | No signal from the user interface | Yes — it points to this display/interface module or its connection cable with the main PCB. |
| F18 | User interface fault | Yes — it corresponds to this display/control board module. |
| F13 | Main PCB fault | No — that code is for the MAIN PCB (a different part), not for this display. |
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 05721000 PCB.
- Catalogue reference
- 05721000
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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 F 28 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 05721000
Does this panel work for an Isofast C24 EV or only for the F28 E1?
Is the panel of the Isomax F28 E the same as that of the Isofast F28 E1?
Spare parts related to Saunier Duval Isofast
