Hamworthy Wiring Harness AA076624

The Hamworthy AA076624 is a wiring harness supplied as a replacement electrical loom for Hamworthy appliances. It carries low-voltage control and sensor signals between the boiler's main PCB and the components it manages, such as the fan, pump, gas valve and temperature sensors. Because it is a manufacturer part, the plug housings, pin count and lead lengths are built to the original pattern for the appliance range it serves.

• Intermittent faults or random lockouts that clear on their own, often pointing to a broken conductor or poor terminal contact
• The boiler fails to fire or the fan, pump or gas valve does not run when the PCB calls for it
• Insulation that has become brittle, cracked or chafed where the loom passes close to hot or sharp components
• Overheated, discoloured or corroded connector pins and plug housings
• Fault codes that persist after the sensor or component at the end of the loom has already been replaced

• Confirm the appliance model and serial number against the compatibility list, as Hamworthy uses different looms across its ranges
• Compare the connector count, plug shape and lead lengths with the harness removed from the boiler before ordering
• Inspect the terminals at both ends for heat damage, and replace any damaged sensor or component as well as the loom
• Isolate the electrical supply and follow the manufacturer's wiring diagram when fitting