Pressure Captor Saunier Duval Isomax F 35 H MOD Ref. S5720500
RefurbishedSaunier DuvalPressure sensors

Pressure Captor Saunier Duval Isomax F 35 H MOD Ref. S5720500

Stock · 7 units

If you notice incorrect pressure readings on your boiler or experience lockouts due to a false lack of pressure, you may need the Saunier Duval Isomax F 35 H Pressure Sensor MOD Ref. S5720500. This sensor measures the pressure of the water circuit and sends the information to the control board. When it fails, it can trigger fault code F9: Water pressure detector failure. It is installed in boilers from the ThemaClassic range, such as the F 25 E and C 25 E, as well as in the Isofast F 35 E model, among others. It should be replaced when it shows reading failures or operational lockouts.

VAT included

Compatibility

Saunier Duval boilers compatible with reference S5720500

Pressure sensor with reference S5720500. Six confirmed compatibilities: F 25 E and C 25 E.

Proven compatibility

Boiler modelFamilyVerification
Saunier Duval F 25 EThemaClassicContrasted
Saunier Duval C 25 EThemaClassicContrasted
Saunier Duval F 30 EThemaClassicContrasted
Saunier Duval C 24 E1ThemaClassicContrasted
Saunier Duval F 24 E1ThemaClassicContrasted
Saunier Duval F 35 EIsofastContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

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.

  1. 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.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

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 display shows pressure at zero or almost zero even though the circuit is full and there are no visible leaks.

    Cause: The sensor does not send the correct signal to the control board, which relies on that data and not on the actual water.

    Check with an external manometer if the actual pressure matches what is displayed on the screen before replacing the part.

  • 02

    The boiler intermittently locks out due to low pressure, with no leaks or water loss.

    Cause: An unstable signal sensor generates low pressure warnings that do not reflect the actual state of the circuit.

    Check the wiring and connector of the sensor for oxidation or a loose connection before replacing it.

  • 03

    The pressure number fluctuates on the display without any manipulation of the filling.

    Cause: If the sensor fails, it incorrectly transforms the water pressure into an electrical signal and the reading varies without reason.

    Bleed the radiators and the circuit first: trapped air causes the same effect and does not require changing the sensor.

  • 04

    The display remains fixed at a value, regardless of whether the system is filled or bled.

    Cause: The sensor may become stuck on a reading and not respond to actual pressure changes.

    Try adjusting the pressure by filling it a little and see if the reading changes, even if it's just slightly.

Fault codes from Saunier Duval that this spare part resolves.

CodeFaultDiagnosis and solution
F9Water 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.

Technical data

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
Documentation

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

Frequently Asked Questions

Frequently asked questions about the pressure sensor S5720500

Is this pressure sensor suitable for the Saunier Duval Isomax F 35 H-MOD?
Yes, the Isomax F 35 H-MOD is on the list of boilers compatible with this part, the pressure sensor Saunier Duval Isomax F 35 H MOD Ref. S5720500.
Is this pressure sensor compatible with the Saunier Duval ThemaClassic F 25 E?
Yes, the pressure sensor Saunier Duval Isomax F 35 H MOD Ref. S5720500 is compatible with the ThemaClassic F 25 E.
Can I use this pressure sensor in the Saunier Duval ThemaClassic C 25 E?
Yes, the ThemaClassic C 25 E is one of the models compatible with the pressure sensor Saunier Duval Isomax F 35 H MOD Ref. S5720500.
How many models are compatible with this pressure sensor?
The pressure sensor Saunier Duval Isomax F 35 H MOD Ref. S5720500 is compatible with a total of 6 models.
What fault code is documented for this pressure sensor?
The documented fault code for the pressure sensor Saunier Duval Isomax F 35 H MOD Ref. S5720500 is F9.

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Pressure Captor Saunier Duval Isomax F 35 H MOD Ref. S5720500