Vaillant Draught Diverter 509589

The Vaillant draught diverter, part number 509589, is a 130 kW flue component fitted to the Atmocraft VK 1304/9 gas boiler. It sits at the flue outlet and stabilises the draught, drawing in secondary air so the appliance maintains a steady, safe combustion path. It is a serviceable item, renewed when the existing diverter is corroded, distorted or no longer holding correct combustion readings.

• Corrosion, cracking or distortion of the diverter body
• Soot deposits or staining around the flue outlet
• Erratic flame picture or combustion readings outside the manufacturer's limits
• Spillage or unstable draught indicated during flue gas analysis
• Physical damage found during an annual service

• Confirm the appliance is an Atmocraft VK 1304/9 and that the existing diverter is the 130 kW variant
• Check part number 509589 against the appliance's parts list
• Have the flue and combustion readings checked first, as draught faults can have causes elsewhere in the flue
• Flue and combustion work must be carried out by a Gas Safe registered engineer