Saunier Duval ThemaClassic C 25 E Pressure Sensor Ref. S5720500
When you open the tap or turn on the heating, the pressure sensor Saunier Duval ThemaClassic C 25 E measures the pressure of the circuit and sends this information to the boiler's PCB. If this sensor fails, you will notice incorrect readings and the boiler may lock out due to a false low pressure, displaying the fault code F9. This sensor is compatible with several models in the ThemaClassic range, such as the F 25 E, C 25 E, and F 30 E, among others. It should be replaced when you observe these symptoms or if the boiler has issues related to water pressure.
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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 pressure on the display is very low or zero, even though the circuit is full and leak-free.
Cause: The sensor does not correctly convert the water pressure into the signal that the control board needs.
Confirm with a separate manometer what the actual pressure of the circuit is before changing it.
- 02
The boiler turns off due to low pressure sporadically and then starts normally without having touched the filling.
Cause: A sensor with an unstable signal causes low pressure alerts that do not match the actual water pressure.
Check the wiring and the connector of the sensor for moisture or oxidation before replacing it.
- 03
The pressure value on the screen fluctuates on its own, without anyone touching it.
Cause: When the sensor fails, the pressure reading becomes erratic, even though the water in the circuit is stable.
Bleed the air from the radiators first, as air can also cause pressure fluctuations and it is not always the sensor.
- 04
The number on the screen never changes, neither when filling nor when bleeding the circuit.
Cause: The sensor may become stuck on a reading and not respond to actual pressure changes.
Try adjusting the pressure by filling it a bit and check if the reading reacts before changing the part.
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
- 6 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 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure sensor S5720500
Does this pressure sensor fit the Saunier Duval ThemaClassic C 25 E?
Is this part compatible with the Saunier Duval ThemaClassic F 25 E?
Is the pressure sensor Saunier Duval ThemaClassic C 25 E compatible with the ThemaClassic F 30 E range?
What fault codes are documented for this part?
How many models are compatible with the Saunier Duval CPTC25E pressure sensor?
Does this pressure sensor work for the Saunier Duval ThemaClassic C 24 E1?
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