Hamworthy Weymouth Electronic Pump Assembly 530905053

The Hamworthy 530905053 is an electronic pump assembly supplied for Hamworthy boiler appliances. It is listed by the manufacturer as a single pump assembly for Chesil and Weymouth applications. The pump circulates heating water through the boiler and system circuit.

• The boiler runs but the heating circuit does not reach temperature, or radiators stay cold while the boiler fires.
• Pump noise that persists after venting, such as grinding, rumbling or screeching from the pump head.
• The pump body or connections show weeping, corrosion or staining.
• Repeated overheat or flow-related lockouts that clear when circulation is restored.
• The pump fails to run when called, with no voltage-related fault found elsewhere in the circuit.

• Confirm the appliance model and that the existing pump matches the Hamworthy 530905053 assembly.
• Check the pump head, body and electrical connections against the failed unit before ordering.
• Verify the system has been correctly vented and that the fault is not caused by air, sludge or a wiring fault.
• Have the boiler isolated electrically and the system drained or valved off before fitting.