Saunier Duval Isofast F35 E Flow Detector, Ref. S5720200

Saunier Duval boilers compatible with reference S5720200

Flow meter with reference S5720200. 33 confirmed compatibilities: ThemaClassic C24E and ThemaClassic C25E.

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. S5720200 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 S5720200. 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 and faults that the flow meter S5720200 resolves.

The flow meter detects the passage of water to activate the domestic hot water. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The boiler does not start the burner to provide hot water or heating, as if it does not detect that water is flowing.

  Cause: If there is no water flow signal, the control board does not activate the burner for safety reasons.

  Check the pressure of the installation and make sure there is no clogged pre-filter.

• 02

  The hot water comes in and out, with brief and repeated interruptions while the tap remains open.

  Cause: A faulty flow switch can give intermittent readings, causing the burner to turn off and on for no apparent reason.

  Bleed the circuit and check that the pressure does not fluctuate before replacing the part.

• 03

  A warning from the boiler appears related to the lack of water or flow, even though the system is full.

  Cause: The detector may indicate 'no flow' even though water is circulating properly through the system.

  Check that the pump is working and that no valve is partially closed before considering the part to be exhausted.

• 04

  The problem only occurs with the domestic hot water, not with the heating.

  Cause: If the sensor is in the domestic hot water line, a fault will only be noticed in that service.

  Compare the behavior with heating and with domestic hot water separately before deciding to replace the part.

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 the Saunier Duval S5720200 flow meter

Catalogue reference

S5720200

Brand

Saunier Duval

Type of part

Flow Detectors

Units in stock

1 unit

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.

Embossed number (fin)

116170

Manuals and technical documentation

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

• Saunier Duval Thematek S F24E Manual (PDF)Document © Saunier Duval, provided as a technical reference.