Saunier Duval Display Module Control Board Isomax F 28 Ref. 05721000
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Saunier Duval Display Module Mando Isomax F 28. This control PCB is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. When it fails, fault codes F12, F18, or F13 may appear. This module is compatible with several boilers, including models C 28 E, C 28 E1, F 28 E, and F 28 E1, among others. It should be replaced when the symptoms of failure become evident.
VAT included
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 panel does not turn on at all, not even for a moment.
Cause: Indicates that it is not receiving power, usually due to an issue with the flat connection cable to the PCB.
Make sure that the flat cable connector is properly seated at both ends before replacing the part.
- 02
The panel lights up for a second when power is supplied to the boiler and then turns off.
Cause: This is usually an intermittent false contact in the flat cable or its connector, not a total failure of the module.
With the boiler turned off, disconnect and reconnect the flat cable at both ends to rule out dirt or oxidation before replacing it.
- 03
The buttons do not respond even though the screen is on.
Cause: The button membrane can fail independently of the display part, even though they are in the same module.
Test each button separately; if all fail at once but the screen works, first check the cleanliness of the panel itself.
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
- 5 units
- 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
Is this display module compatible with an Isomax C 28 E2?
What fault does this display module solve in the Isofast F 35 E?
What does this display module include?
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