Hamworthy Gas Control Nat VR4605C 1144 573409083

This is a Hamworthy gas control valve, manufacturer part number 573409083, carrying the VR4605C 1144 designation. It regulates the supply of natural gas to the burner on Hamworthy gas boilers, opening and modulating gas flow in response to the appliance's demand signal. It is listed within the Hamworthy spare parts range for boiler applications.

• The burner fails to ignite despite a confirmed heat demand and working ignition components.
• The boiler locks out repeatedly or intermittently, with lockout codes pointing to a gas supply or flame detection fault.
• Flame quality is poor, with unstable or weak combustion at the burner.
• The valve does not respond to modulation signals, so the boiler runs at a fixed rate or not at all.
• A smell of gas is present around the valve body or its connections.

• Confirm the part number on the existing valve matches 573409083 before ordering.
• Check the appliance model against the manufacturer's parts list to confirm this valve is listed for it.
• Verify the appliance is set up for natural gas, as this valve is specified for NAT operation.
• Gas valve replacement is a gas safety-critical task and must be carried out by a competent, registered engineer.