The Vaillant 0020039708 is a genuine OEM flow switch designed to monitor the movement of water within compatible Vaillant boilers. This component detects when there is sufficient water flow through the heating or hot water circuit and signals the boiler to operate safely and efficiently.

If the flow switch becomes faulty, symptoms may include intermittent hot water, no heating, error codes, or the boiler failing to ignite. Replacing it with this genuine Vaillant part ensures accurate detection, reliable operation, and the safe performance of the appliance.

Key Features:

• Genuine Vaillant flow switch

• Accurately detects system water flow

• Ensures safe boiler operation and correct burner activation

• Helps resolve hot water and heating flow faults

• Manufactured to Vaillant’s strict OEM quality standards

• Durable construction for long-term reliability

• Direct-fit replacement for quick, professional installation

Compatibility

The Vaillant 0020039708 Flow Switch is compatible with:

• Selected ecoTEC models

• Selected turboTEC range boilers

• Any Vaillant appliance listing 0020039708 in its official parts documentation

Engineers should always confirm exact compatibility using the boiler’s service manual or model-specific parts list.