Worcester Bosch Wiring Harness High Voltage 8716117074

The Worcester Bosch 8716117074 is a high voltage wiring harness used inside Worcester Bosch Greenstar i ErP System gas boilers. It carries the mains-side electrical connections between the boiler's control components, so the appliance's ignition, fan and pump circuits receive power and switching signals as intended. As a factory-specified loom, it plugs into the existing connector points on the boiler without modification.

• The boiler fails to fire or cuts out intermittently with no obvious mechanical cause
• Fault codes relating to power supply, fan or ignition appear and clear at random
• Visible heat damage, brittle or cracked insulation on the loom
• Loose, corroded or discoloured spade and plug connectors
• Continuity testing shows an open circuit or intermittent break in a conductor

• Check the GC number and appliance serial plate to confirm the harness matches your boiler variant
• Confirm the existing harness carries the number 8716117074 or the alternative number 1031089 before ordering
• Inspect the connector housings and any seals disturbed during removal, and renew them if damaged
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.