Cooktop appliance with a gas burner assembly

A cooktop appliance, comprising:

• a top panel;
• a gas burner assembly positioned at the top panel, the gas burner assembly comprising one or more burner bodies defining a first plurality of flame ports, a first fuel chamber, a second plurality of flame ports, and a second fuel chamber, the first fuel chamber being in fluid communication with the first plurality of flame ports such that gaseous fuel within the first fuel chamber is flowable through the first plurality of flame ports, the second fuel chamber being in fluid communication with the second plurality of flame ports such that gaseous fuel within the second fuel chamber is flowable through the second plurality of flame ports, the first fuel chamber being separate from the second fuel chamber within the one or more burner bodies;
• a dual-outlet control valve comprising a first outlet in fluid communication with the first fuel chamber for providing a first flow of the gaseous fuel and a second outlet in fluid communication with the second fuel chamber for providing a second flow of the gaseous fuel, wherein the dual-outlet control valve is movable to a boost position where the first flow of gaseous fuel is provided to the first fuel chamber at a low flow rate and the second flow of gaseous fuel is provided to the second fuel chamber;
• a forced air supply source fluidly coupled to the second fuel chamber such that the forced air supply source is operable to urge a flow of air into the second fuel chamber only when the dual-outlet control valve is in the boost position;
• a fuel supply circuit comprising a supply line coupled to an inlet of the dual-outlet control valve, a first branch extending from the first outlet to a first orifice positioned for directing the first flow of gaseous fuel into the first chamber, and a second branch extending from the second outlet to a second orifice positioned for directing the second flow of gaseous fuel into the second chamber, the dual-outlet control valve being configured for regulating gaseous fuel flow to the first and second branches;
• and
• a solenoid valve coupled to the second branch between the second outlet and the second orifice, wherein the solenoid valve is operably coupled to the forced air supply source and is configured to stop the second flow of gaseous fuel in the event of a failure of the forced air supply source.