Pressure Sensor Saunier Duval Isofast F 28 E - Ref. S5720500
When you open the tap or turn on the heating, the pressure sensor Saunier Duval Isofast F 28 E measures the water pressure in the circuit and sends that information to the control board. If this component fails, you may notice incorrect readings and lockouts, such as the fault code F9, which indicates a fault with the water pressure detector. This sensor is compatible with boilers from the ThemaClassic and Isofast ranges, including models like the F 25 E and the F 35 E, among others. It is recommended to replace it if you experience pressure issues in the system.
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 locks out with a pressure fault code, even though the circuit is properly filled.
Cause: The sensor sends an incorrect value, causing the control unit to think that there is a lack of water and to cut off the ignition for safety.
Note the fault code displayed by the boiler and check it in the manual before purchasing the spare part.
- 02
On the display, the pressure shows zero or a clearly low value, even though there are no leaks or actual water loss.
Cause: The sensor does not correctly transmit the actual pressure of the circuit to the control board.
Compare the reading on the display with an external manometer before confirming that the sensor is faulty.
- 03
The boiler intermittently stops due to low pressure and then starts working again on its own after a while.
Cause: An unstable signal from the sensor causes low pressure warnings that do not reflect the actual state of the circuit.
Check the connector and the wiring of the sensor for any oxidation or loose contact before proceeding to replace it.
- 04
The pressure value on the display fluctuates or jumps without the system being filled.
Cause: A degraded sensor poorly converts hydraulic pressure into an electrical signal, causing fluctuations for no apparent reason.
Bleed the air from the radiators and circuit before changing the sensor, as air can also cause this problem.
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
- 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 (label marking)
- 0020016532
- Batch production
- LOT: 091037 DD
- The code 0020016532 is identical to the one read on the CPSDTF24E datasheet; it could be the same physical component, although it is sold for different boiler lists.
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
For which models is the Saunier Duval Isofast F 28 E pressure switch – Ref. S5720500 compatible?
What fault code indicates a failure in the pressure sensor?
When should I replace the pressure switch in my boiler?
Does this sensor come with batch marking?
What is the reference for this pressure sensor?
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