Saunier Duval Isofast F 28 E PCB (control board)
The control PCB regulates the ignition, the modulation of the burner, the pump, and the safety features of the boiler. This component, manufactured by ZETTLER and with reference S1019000, is essential for the operation of models such as the Saunier Duval Isofast F 28 E, among others. When it fails, the boiler may not start, become locked, or exhibit erratic behavior. The associated fault codes are 13: Main printed circuit board failure and 20: Communication defect/incompatible interface with the main board. It is recommended to replace the control PCB upon noticing these symptoms or in case of failure.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05724800
PCB with reference 05724800. Eight confirmed compatibilities: C 28 E and C 28 E NOx.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 28 E | Isofast | Contrasted |
| Saunier Duval C 28 E NOx | Isofast | Contrasted |
| Saunier Duval F 28 E | Isofast | Contrasted |
| Saunier Duval C 35 E | Isofast | Contrasted |
| Saunier Duval F 35 E | Isofast | Contrasted |
| Saunier Duval C 24 E V | Isofast | Contrasted |
| Saunier Duval C 28 E | Isomax | Contrasted |
| Saunier Duval F 28 E | 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. 05724800 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 05724800. 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 05724800 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 pumps, the gas valve, or the fan do not start even though the boiler is requesting heat.
Cause: The PCB controls those outputs through relays; if a contact does not work, the component does not receive power.
With the boiler in demand, measure if there is power at the output connector to the component that is not starting.
- 02
The boiler ignites and shuts off after a few seconds, repeatedly.
Cause: A faulty output relay with a defective contact interrupts the current needed to maintain the ignition.
Check that the connectors on the PCB are properly seated and free of oxidation before replacing it.
- 03
The panel lights up but nothing happens when requesting heating or domestic hot water.
Cause: The PCB receives the demand signal but does not activate the output that ignites the burner.
Confirm that the thermostat or the domestic hot water tap is actually generating the signal before assuming that the PCB is faulty.
- 04
Intermittent fault codes appear or the boiler restarts by itself for no apparent reason.
Cause: A fault in the control electronics causes unstable readings from the sensors connected to the PCB.
Note the code and the moment it appears: sometimes it indicates a specific sensor and not the entire PCB.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 13 | Main printed circuit board fault. | The main PCB is faulty. Check auxiliary voltages (5/12 VDC) and connectors of the PCB; if the power supply and wiring/UI are correct and the board does not deliver voltages or shows damage/continuous reset, replace the PCB. |
| 20 | Communication fault/incompatible interface with the main PCB. | The main PCB is incompatible or there is a communication failure with the user interface (coding/DSN or e‑Bus). Verify product code and compatibility UI↔PCB; if the fault persists with the correct UI, the cause is the PCB. |
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 05724800 PCB.
- Catalogue reference
- 05724800
- 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
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Relay manufacturer
- ZETTLER
- Relay contact voltage/current
- AC 250V 8A
- Relay certification
- UL
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 05724800
Does this PCB work for a Saunier Duval Isofast F 28 E?
What other models is the Saunier Duval PLSA103 PCB compatible with?
What fault codes are documented for this PCB?
What type of relays does the PCB of the Isomax F 28 E have?
How many models are compatible with the Saunier Duval PLSA103 PCB?
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