Pressure Captor Saunier Duval Themafast C 24 E Ref. S5720500
The pressure sensor Saunier Duval Themafast C 24 E is a sensor that measures the water pressure in the boiler circuit. Its function is to send the pressure reading to the PCB, and when it fails, erroneous readings and lockouts due to false low pressure can occur. The user may notice symptoms such as fault code F9, which indicates a failure of the water pressure detector. This sensor is compatible with several boilers from the ThemaClassic range, such as the F 25 E, C 25 E, and F 30 E, among others. It should be replaced when the mentioned symptoms occur.
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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 shuts down and shows a pressure fault, even though the water in the circuit has good pressure.
Cause: The sensor sends an incorrect reading to the PCB, which thinks that there is a lack of water even though that is not true.
Measure the pressure with the analog manometer of the boiler (if it has one) or with an external one before relying on the digital reading.
- 02
The display shows a pressure fault code that appears and disappears for no apparent reason.
Cause: A sensor with unstable readings sends fluctuating values, causing the control unit to lock when crossing the minimum threshold.
Bleed the air from the radiators and the circuit: trapped air can cause the actual pressure to vary and be mistaken for a fault in the sensor.
- 03
The boiler won't start, as if there isn't enough pressure.
Cause: If the sensor does not send a signal to the PCB, it blocks the ignition for safety, even if the circuit is full.
Check the connector of the sensor: a loose or oxidized pin can interrupt the signal, just like an internal fault.
- 04
When opening the filling tap, the pressure on the boiler's manometer rises, but the pressure fault persists.
Cause: This indicates that the problem lies in the electronic reading, not in the actual pressure of the circuit, and suggests a fault in the sensor.
Note the pressure indicated by the mechanical manometer and compare it with that of the digital display; if they do not match, the sensor may be faulty.
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
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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.
- Code printed on label
- 0020016532
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 fault does the pressure sensor Saunier Duval Themafast C 24 E Ref. S5720500 resolve?
Is this pressure sensor compatible with the Saunier Duval ThemaClassic F 25 E?
How many models are compatible with the pressure sensor CPTC24E?
What fault code is documented for this pressure sensor?
Is this sensor suitable for the Saunier Duval ThemaClassic C 25 E?
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