Saunier Duval Themafast F 25 E Flow Switch - 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 heating works perfectly, but when I turn on the hot water tap, it doesn't heat up.

  Cause: The flow meter does not detect the flow of water and the control board does not receive the command to start the burner for domestic hot water.

  Check that the mixing tap is not set only to cold and that there is normal mains pressure before suspecting the sensor.

• 02

  It is difficult for the burner to start when you begin using hot water.

  Cause: The flow switch contact has degraded and requires more flow or more time to close the circuit.

  Open the tap to maximum flow; if it ignites sooner with high flow, the sensor is losing sensitivity.

• 03

  The water comes out hot and cold alternately without touching the faucet.

  Cause: The flow detector activates and deactivates the burner irregularly due to an unstable contact.

  First, rule out that there is no pressure drop in the system when using other water points simultaneously.

• 04

  There is no fault indicated on the control panel, but the hot water is not reaching.

  Cause: This sensor can fail silently, without triggering a specific fault code.

  Check the same symptom at another faucet in the house to ensure that the fault is in the boiler and not in the installation.

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

5 units

Status

Refurbished

Warranty

1 year

Shipping

1-2 business days

Return

14 days

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.