Worcester Bosch Wiring Harness Main SMPS Highflow 8716118475

The Worcester Bosch 8716118475 is the main SMPS wiring harness used on Greenstar Highflow CDi ErP appliances. It carries the low-voltage supply and signal connections between the switched-mode power supply board and the main control, forming part of the boiler's internal electrical loom. The harness is supplied as a complete assembly with its moulded plugs and terminals already fitted, so it can be routed and connected without re-terminating individual cores.

• The appliance fails to power up or the display stays blank when the supply is present
• Intermittent shutdowns or resets that trace back to a loose or damaged harness plug
• Visible chafing, heat damage or discoloured insulation on the loom
• Corroded or pushed-back terminals in the SMPS connector housing
• Fault codes relating to the power supply or control communication that persist after board checks

• Confirm the appliance GC number and model against the compatibility list, as the harness is specific to the Greenstar Highflow CDi ErP range
• Check the existing harness label or plug markings against 8716118475 and the earlier numbers 8-716-117-677 and 8716117677 before ordering
• Inspect the SMPS board connectors for damage at the same time, since a faulty plug can affect a replacement harness
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.