Pressure Captor Saunier Duval Isomax Condens F 35 E Ref. S5720500
The Saunier Duval Isomax Condens F 35 E Pressure Sensor Ref. S5720500 is a sensor that measures the pressure of the water circuit and sends this information to the control board. When it fails, it can cause incorrect readings and lockouts due to false low pressure, which can lead to improper operation of the boiler. This sensor is compatible with models from the ThemaClassic range such as the F 25 E and the Isofast, among others. It is recommended to replace it when the mentioned symptoms occur or the fault code F9 is detected.
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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 reading remains fixed at a number and does not change even if you bleed or refill the circuit.
Cause: The sensor can get stuck and stop responding to the actual changes in water pressure.
Fill or bleed the circuit a little while checking the display: if the number does not change, the sensor is the main suspect.
- 02
From time to time, the boiler shuts down and indicates low pressure, although everything seems normal shortly after.
Cause: A flashing signal from the sensor generates low pressure warnings that do not correspond to the actual water in the circuit.
Check the electrical connections of the sensor before replacing it: a loose contact can cause the same symptoms.
- 03
On the display, the pressure fluctuates several tenths without any changes being made to the system.
Cause: If the sensor is damaged, it incorrectly converts the hydraulic pressure into an electrical signal and the value fluctuates without apparent cause.
Eliminate any air in the circuit by bleeding the radiators; air can also cause those fluctuations.
- 04
A pressure fault appears on the display and the boiler does not start, even though the circuit is at the correct pressure.
Cause: When the sensor provides an incorrect value, the control board interprets that there is not enough water and blocks the ignition for safety reasons.
Note the fault code and confirm in the manual that it corresponds to pressure before purchasing the spare 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
- 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
Does this pressure sensor work for the Isomax Condens F 35 E?
Is it compatible with the ThemaClassic range?
How many models are compatible with this pressure sensor?
What fault code is documented for this product?
Does this pressure sensor work for the Isofast range?
Spare parts related to Saunier Duval ThemaClassic
