Biasi Diverter Valve Kit BI1801103

The Biasi BI1801103 is a diverter valve kit for Biasi Rinnova Adaptive M300V combi boilers. The diverter valve directs the boiler's heated primary water either to the domestic hot water plate heat exchanger or around the central heating circuit, depending on demand. This kit is supplied as a complete assembly for servicing or replacing a failed diverter valve on the listed models.

• Domestic hot water runs cold or only lukewarm while the boiler fires
• Radiators heat up when a hot tap is opened, indicating the valve is not diverting fully
• No heating on the central heating circuit while hot water demand is satisfied
• Water passing between the heating and hot water circuits, or pressure loss on the primary side
• The valve body or actuator shows signs of scale, seizure or leakage

• Confirm the boiler model and GC number against the appliance data badge
• Check whether the fault lies with the valve body, the actuator head or the wiring before ordering
• Isolate the boiler, drain the relevant circuit and confirm the system is clean before fitting
• Verify the part number BI1801103 matches the number on the existing component or the manufacturer's parts list