Worcester Bosch Return Manifold CH Bypass Open 87186449940

The Worcester Bosch return manifold (CH) with bypass open is a hydraulic component fitted to the central heating return circuit of Worcester Greenstar 2000 Combi Gr2300IW appliances. It routes return water through the manifold and incorporates an open bypass path within the assembly. It is supplied under Worcester Bosch part number 87186449940.

• Water weeping or staining around the manifold body or its connections
• Loss of system pressure that cannot be traced to other components
• Poor or uneven heating output linked to restricted flow through the return circuit
• Visible corrosion, scaling or cracking on the manifold
• Bypass function not operating as expected, affecting flow through the heating circuit

• Confirm the appliance model and GC number against the fit list above
• Check whether the boiler is the 25 C or 30 C variant and whether it is NG or LPG
• Verify the existing manifold configuration is bypass open before ordering
• Inspect associated seals and connections for condition, as these are not confirmed as part of this item