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Shop Ariston boiler return units and hydraulic return assemblies for selected combi and system boilers. The return unit directs central-heating water back through the boiler and may include valves, filters, seals or pipe connections, depending on the model. Before ordering an Ariston replacement return unit, confirm the full boiler model, GC number and part number shown on the existing component.
A damaged Ariston return unit may cause internal leaks, falling system pressure, poor circulation or water around the hydraulic assembly. Worn seals, cracked housings, blocked waterways or damaged connections can produce similar symptoms.
Restricted circulation may also contribute to overheating and the Ariston 101 fault code, although the pump, heat exchanger, filter and sensors should also be checked.
Internal hydraulic components should be diagnosed and replaced by a suitably qualified engineer. Before ordering, compare the existing return-unit part number with the product listing and confirm the boiler model and GC number.
