Worcester Bosch 4-Way Mixer 87183100210

The 4-way mixer is a four-port mixing valve used in the water circuit of Worcester Bosch Greensource air/water heat pumps. It regulates the mixing of flow and return water within the appliance, allowing the heat pump to control the temperature of the water passing through the system. It is supplied by Worcester Bosch under part number 87183100210.

• The heat pump fails to reach or hold the set flow temperature
• Heating or hot water output is inconsistent or reduced across the system
• The valve body shows signs of water weeping or staining around the ports
• The mixer becomes stiff, seized or fails to modulate as demand changes
• Fault codes or lockout conditions relating to water circuit temperature control

• Confirm the appliance model and kW rating against the fitment list above
• Check the part number on the existing component or the appliance parts list before ordering
• Inspect the surrounding pipework and connections for damage that may also need attention
• Verify that the fault is with the mixer itself and not with the actuator or control signal driving it