Pressure Sensor Saunier Duval Thema NOx F25 B1 Ref. S5720500
If you notice incorrect pressure readings or blockages in your boiler, you may need the pressure sensor Saunier Duval Thema NOx F25 B1. This part measures the water circuit pressure and sends the information to the control board. When it fails, it can trigger the fault code F9: water pressure detector failure. It is compatible with models from the ThemaClassic range, such as the F 25 E and the C 25 E, among others. It is recommended to replace it if you experience these symptoms to avoid further issues.
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Consult via WhatsAppSaunier Duval boilers compatible with reference S5720500
Pressure sensor with reference S5720500. Six confirmed compatibilities: F 25 E and C 25 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 25 E | ThemaClassic | Contrasted |
| Saunier Duval C 25 E | ThemaClassic | Contrasted |
| Saunier Duval F 30 E | ThemaClassic | Contrasted |
| Saunier Duval C 24 E1 | ThemaClassic | Contrasted |
| Saunier Duval F 24 E1 | ThemaClassic | Contrasted |
| Saunier Duval F 35 E | Isofast | 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. S5720500 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 S5720500. 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 pressure sensor S5720500 resolves.
The pressure sensor measures the water pressure for the electronics. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not ignite even though the circuit is filled with water.
Cause: The pressure switch prevents the PCB from functioning, blocking the ignition for safety.
Confirm with the manometer that there is real pressure (1-1.5 bar) before changing the sensor.
- 02
The display shows a low pressure warning even though the pressure gauge reads correctly.
Cause: There is a difference between the actual pressure and the one detected by the PCB through the sensor, which indicates that the part has lost calibration.
Note the value of the manometer and compare it with that of the digital display at the same moment, before and after bleeding.
- 03
The boiler does not respond to the fault, as if it does not detect pressure in the circuit.
Cause: If the sensor does not send a signal to the PCB, it thinks there is no pressure, even though the circuit is full.
Check the electrical connection of the sensor to the PCB (cable and connector) before considering that the part is broken.
- 04
The pressure fault occurs right when trying to ignite, not during normal operation.
Cause: The PCB checks the signal from the sensor when starting; if it is not correct, it stops the cycle before beginning.
Reset the boiler and observe if the fault occurs at the same moment during startup; this helps to determine if the problem is with the sensor or another sensor.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F9 | Water pressure sensor fault. | The pressure transducer S5720500 delivers an absent/out-of-range signal or does not reach the PCB, the electronics interpret an abnormal pressure and lock with F9; verify by measuring the sensor signal and the harness/wiring and comparing with an external manometer. |
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 Saunier Duval pressure sensor S5720500
- Catalogue reference
- S5720500
- Brand
- Saunier Duval
- Type of part
- Pressure sensors
- 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.
- part code
- PSN0001A
- country of manufacture
- MADE IN FRANCE
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure sensor S5720500
What code is engraved on the pressure sensor Ref. S5720500 of the Thema NOx F25?
What fault does the pressure sensor Ref. S5720500 resolve in an Isofast C28 E?
Is this pressure switch suitable for a Saunier Duval Themaclassic F25 E?
What is the function of the pressure switch in the Thema NOx F25?
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