Pressure Sensor Saunier Duval Isofast Condens F 35 E Ref. S5720500
If you experience a fault with the water pressure detector, you may need the Saunier Duval Isofast Condens F 35 E Pressure Sensor Ref. S5720500. This sensor measures the pressure of the water circuit and sends the information to the control board. When it fails, it can cause incorrect readings and lockouts in the boiler. This sensor is compatible with boilers from the Isofast range, such as the F 35 E, among others. It is recommended to replace it when you notice issues with pressure readings or lockouts in operation.
VAT included
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 start and a pressure warning appears on the screen, even though the circuit is at the correct pressure.
Cause: The PCB interprets an incorrect signal from the pressure sensor.
Before changing the part, check the actual pressure with a mechanical manometer if you have one in the circuit.
- 02
The pressure on the display never changes, neither when heating nor when bleeding a radiator.
Cause: The sensor has stopped transmitting actual pressure changes to the control board.
Bleed a radiator and observe if the reading reacts in the following minutes; if nothing changes, point to the sensor or its connection.
- 03
The boiler stops by itself during operation with a pressure fault, even though it has not lost water.
Cause: A faulty reading from the sensor can cause the PCB to think that the pressure has dropped below the minimum when it has not.
Check the connector and the wiring up to the PCB: a loose connection can produce the same symptom as a faulty sensor.
- 04
The pressure value on the display does not match what the boiler indicated before the fault, without you having refilled or bled.
Cause: A progressive misalignment of the sensor causes the reading to deviate from the actual pressure over time.
Compare with any previous reference of the usual pressure of this installation, if you have it, before deciding that the sensor is 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
- 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 25 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure sensor S5720500
Is the part photographed in this sheet the pressure sensor or a collector?
Does this black plastic collector work for the Isofast Condens F 35 E?
Is it the same collector as the sensor with the orange connector from the CPIF35EA plug?
How many models are compatible with this collector CPSDICF35E?
What fault code is documented for this product?
Spare parts related to Saunier Duval ThemaClassic
