Baxi Flow Switch Assembly 720545001

The Baxi 720545001 is a flow switch assembly used across the Baxi and Broag Remeha Avanta combi range. It sits in the pipework that serves both the domestic hot water and the central heating circuits, and it carries an in-built sensor. When the pump is powered up, the switch senses the movement of water through the pipe and feeds that information back to the boiler controls, confirming that flow is present before the appliance continues through its sequence.

• The pump runs but the boiler does not fire for heating or hot water
• A domestic hot water draw-off is not recognised, so no hot water is produced
• Intermittent lockout, or fault codes relating to flow or pump proving
• The appliance drops out shortly after start-up and needs repeated reset attempts
• The pump continues to run with no follow-on ignition from the boiler

• Check the GC number and the appliance serial plate against the compatibility list to confirm the model matches.
• The previous number for this item is S62781; compare it with the marking on the component being replaced.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.