Baxi 3 Way Valve Cartridge 7812539

The Baxi 7812539 is a 3 way valve cartridge used in Baxi Combi 2 and Combi 2.1 combi boilers. It sits inside the diverter valve assembly and controls the changeover between domestic hot water and central heating operation. The cartridge is the moving internal component that directs flow, so wear or scale here affects both heating and hot water performance.

• Domestic hot water runs hot and cold, or heating warms up when a hot tap is opened
• Radiators heating when only hot water is demanded
• No hot water while the heating circuit continues to work
• Reduced hot water flow or temperature that fluctuates with other outlets
• Visible scale, scoring or stiff movement on the cartridge when removed

• Confirm the boiler model and GC number against the fitment list above
• Check whether the appliance is the standard or LPG variant
• Inspect the diverter valve body for damage before fitting a new cartridge
• Isolate the boiler, drain down and follow the manufacturer's procedure for the valve assembly