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Shop Ariston diverter valves for selected combi boiler models, including compatible Clas, Genus, E-Combi and Microgenus ranges. The diverter valve directs heated water either to the radiators or the domestic hot-water system. Before ordering an Ariston boiler diverter valve, confirm the full boiler model, GC number and part number printed on the existing valve.
A faulty Ariston diverter valve may cause the heating to work while the taps remain cold, hot water to become intermittent, or radiators to warm when only hot water is being used.
These symptoms can also result from a damaged actuator motor, blocked valve cartridge, sensor fault or poor water circulation. Read our boiler working but no hot water guide for related causes and checks.
Internal boiler repairs should be completed by a Gas Safe registered engineer. Before ordering an Ariston replacement diverter valve, compare the existing part number with the product listing and confirm the boiler model and GC number.
