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

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

If you notice incorrect pressure readings on your boiler or experience lockouts due to a false lack of pressure, a technical diagnosis should confirm if you need the Saunier Duval Isomax F 35 H MOD Pressure Sensor Ref. S5720500. This sensor measures the water circuit pressure and sends the information to the control board. When it fails, it can trigger the 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. A technician should confirm through diagnosis if replacement is necessary when it shows reading failures or operational lockouts.

Type of part
Pressure sensors
Status
Refurbished
Catalogue reference
S5720500
Warranty
1 year
VAT included Stock · 7 units
Compatibility

Saunier Duval boilers compatible with reference S5720500

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

Verified compatibility

Boiler modelFamilyVerification
Saunier Duval F 25 EThemaClassicVerified
Saunier Duval C 25 EThemaClassicVerified
Saunier Duval F 30 EThemaClassicVerified
Saunier Duval C 24 E1ThemaClassicVerified
Saunier Duval F 24 E1ThemaClassicVerified
Saunier Duval F 35 EIsofastVerified

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

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

  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 that require diagnosis in the pressure switch S5720500

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 Saunier Duval that require diagnosis

CodeFaultTechnical checks
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
Uniclima internal SKU
CPIF35HMOD
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
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.

Spare parts related to Saunier Duval ThemaClassic

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