Pressure Sensor Saunier Duval Isofast F 35 E
Refurbished Saunier Duval Pressure sensors

Pressure Sensor Saunier Duval Isofast F 35 E

The water pressure sensor measures the pressure of the circuit and sends the reading to the PCB of the Saunier Duval Isofast F 35 E boiler. When it fails, it can result in incorrect readings, leading to lockouts due to a false lack of pressure. The user may notice symptoms such as fault code F9, which indicates a failure of the pressure detector, or fault codes F.73, F.74, and F.75, which are related to out-of-range signals. This sensor is compatible with several models in the Isofast range, such as C24EV, C28E, C35E, and F35E1, among others. A technician must confirm through diagnosis whether it is necessary to replace it when these symptoms or faults occur.

Type of part
Pressure sensors
Status
Refurbished
Catalogue reference
S57205
Warranty
1 year
VAT included Stock · 6 units
Compatibility

Saunier Duval boilers compatible with reference S57205

Pressure sensor with reference S57205. 41 verified compatibilities: C24EV and C28E.

Proven compatibility

Boiler modelFamilyVerification
Saunier Duval C24EVIsofastContrasted
Saunier Duval C28EIsofastContrasted
Saunier Duval C28E1IsofastContrasted
Saunier Duval C35EIsofastContrasted
Saunier Duval C35E1IsofastContrasted
Saunier Duval F24EIsofastContrasted
Saunier Duval F28EIsofastContrasted
Saunier Duval F28E1IsofastContrasted
Saunier Duval F35EIsofastContrasted
Saunier Duval F35E1IsofastContrasted
Saunier Duval C28EIsomaxContrasted
Saunier Duval C28E2IsomaxContrasted
Saunier Duval F28EIsomaxContrasted
Saunier Duval F28E2IsomaxContrasted
Saunier Duval Condens F35EIsomaxContrasted
Saunier Duval C24EIsotwinContrasted
Saunier Duval F24EIsotwinContrasted
Saunier Duval F28EIsotwinContrasted
Saunier Duval Condens F30-AIsotwinContrasted
Saunier Duval C24EThemaplusContrasted
Saunier Duval F24EThemaplusContrasted
Saunier Duval F25EThemaplusContrasted
Saunier Duval F30EThemaplusContrasted
Saunier Duval C24EThemafastContrasted
Saunier Duval F24EThemafastContrasted
Saunier Duval Condens F24EThemafastContrasted
Saunier Duval Condens F30EThemafastContrasted
Saunier Duval F24EThemaclassicContrasted
Saunier Duval F25EThemaclassicContrasted
Saunier Duval C24EThemaclassicContrasted
Saunier Duval FAS24EThemaclassicContrasted
Saunier Duval FAS25EThemaclassicContrasted
Saunier Duval F24EThemacondensContrasted
Saunier Duval F25ThemacondensContrasted
Saunier Duval FAS25ThemacondensContrasted
Saunier Duval C18EThematekContrasted
Saunier Duval C24EThematekContrasted
Saunier Duval F24EThematekContrasted
Saunier Duval C24EThemaContrasted
Saunier Duval Condens F25ThemaContrasted
Saunier Duval Condens F25SemiaContrasted

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

Guide

How to check if ref. S57205 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 S57205. 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 S57205

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 on the display is at zero or very low, even though the circuit is full and leak-free.

    Cause: The sensor does not correctly translate the water pressure, sending an incorrect signal to the control board.

    Before changing it, measure the pressure with an additional manometer to verify if it matches what is displayed.

  • 02

    The boiler turns off due to "lack of pressure" from time to time, without anyone having touched the filling or there being any puddles.

    Cause: The sensor sends intermittent signals that cause incorrect low pressure readings to the control board.

    Check the connector and the cable of the sensor for moisture or oxidation before replacing the part.

  • 03

    The pressure number on the display fluctuates on its own, as if it has a life of its own.

    Cause: If the sensor fails, the conversion of water pressure to electrical signal becomes unstable, causing variations without any real reason.

    Bleed the air from the radiators and the circuit, as trapped air can cause pressure fluctuations that may be mistaken for a fault in the sensor.

  • 04

    The boiler does not ignite and the fault code indicates a pressure problem, but the circuit is properly filled.

    Cause: If the sensor sends an anomalous value, the control unit interprets that there is a lack of water and blocks the start for safety.

    Note the exact code displayed by the boiler and compare it with the manual before assuming that the problem is with the sensor.

Fault codes Saunier Duval that require diagnosis

CodeFaultTechnical checks
F9Water pressure sensor fault.The S57205 sensor does not deliver a valid signal (loose connector, short circuit, or obstructed hydraulic connection) and the PCB does not 'see' pressure; check wiring and pressure reading in diagnostic/menu and verify that the signal changes when pressurizing.
F.73Water pressure sensor signal out of range (too low).Interruption/short circuit of the sensor or ground in the cable; check power supply and sensor signal, continuity of the harness, and ensure the sensor port is not blocked.
F.74Water pressure sensor signal out of range (usually too high).This symptom may be related to the part, but it does not confirm that it is faulty. A technician must check the equipment and its inspection according to the manual before deciding on a repair or replacement.
F.75No increase in pressure detected when the pump starts (pressure sensor and/or pump).The sensor does not detect the pressure 'spike' due to a faulty sensor or blocked intake (first rule out air/lack of water/pump); check the pressure reading during start-up in service mode and the continuity/power supply of the sensor.

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 S57205

Catalogue reference
S57205
Uniclima internal SKU
CPIF35EHMOD
Brand
Saunier Duval
Type of part
Pressure sensors
Units in stock
6 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Batch number
0601220... (the 'L' at the beginning of 'LOT' and the end of the number are out of frame)
Label code
...1444/01 (prefix cut off by framing)
Frequently Asked Questions

Frequently asked questions about the pressure sensor S57205

Does this pressure switch work for the Isofast F 35 E?
Yes, it is listed as compatible with the Isofast F 35 E, as well as with other models Isofast, Isomax, Isotwin, Thema Condens, Themaclassic, Themafast, and Thematek.
What batch and code does the label of this collector, ref. S57205, retain?
A partial batch (0601220...) and a partial code (...1444/01), both cut off by the frame of the photo.
Is this sensor compatible with the Isotwin F 24 E or the Thematek F 24 E?
Yes, both models are listed as compatible boilers with this part.

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Pressure Sensor Saunier Duval Isofast F 35 E