Pressure Sensor Saunier Duval Isofast C 28 E

Saunier Duval boilers compatible with reference S57205

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

Proven compatibility

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. 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.

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 display shows a pressure different from that of the filling gauge of the boiler.

  Cause: The sensor does not correctly convert the circuit pressure into an electrical signal, resulting in the PCB having incorrect data.

  Compare both readings just after filling, with the boiler cold, to confirm the difference before replacing the part.

• 02

  A low pressure fault code appears when starting, even though the circuit is properly filled.

  Cause: The PCB receives an incorrect value from the sensor and cuts off the start as a safety measure.

  Check for any visible leaks in the filling valve, bleed valves, or radiators before concluding that the sensor is faulty.

• 03

  The pressure reading shakes or blinks on the screen without you having touched anything in the circuit.

  Cause: A sensor with a damaged diaphragm or internal circuit provides unstable readings, even though the actual pressure is constant.

  Leave the boiler unused for a while and observe if the reading stabilizes; if it continues to fluctuate, it is more likely that the problem is with the sensor rather than the circuit.

• 04

  After filling the circuit, the pressure on the display does not increase or increases very little.

  Cause: The sensor may not be accurately recording the actual increase in water pressure.

  Confirm with the filling process (time the tap is open and expected final pressure) that enough water has actually entered.

Fault codes Saunier Duval that require diagnosis

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 S57205

Catalogue reference

S57205

Uniclima internal SKU

CPIC28EA

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

Part data and available documentation

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

Batch number

0519... (cut off by the edge of the photo)