Baxi 720480401 Potterton Dungs 117332 Ebmpapst Gas Valve

The Baxi 720480401 is a gas combination valve block — a combined valve assembly that regulates gas and water flow through the appliance. It sits in the gas and water circuit and is responsible for holding steady flow rates so the boiler can light, modulate and deliver hot water reliably. The part is supplied by Baxi as a direct replacement component for their own appliance range.

• The boiler fails to light or drops out shortly after ignition, with the gas valve not opening or closing cleanly.
• Hot water output is erratic, running hot then cold as flow through the valve body becomes inconsistent.
• Gas pressure readings at the test point fall outside the figures given in the appliance's service instructions.
• Water weeps from the valve body, spindle or joint faces, leaving staining or scale around the assembly.
• The valve spindle is stiff, seized or does not respond smoothly when adjusted.

• Confirm the part number against the data plate and the appliance's spare parts list — Baxi use several valve variants across their ranges.
• Note the GC number and serial number of the appliance so the correct variant can be matched.
• Check whether a gasket, washer or seal kit is needed to complete the repair, as these are often replaced at the same time.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.