This part is located around the fan section. The fan is the device that pushes fresh air in to the combustion chamber, allowing the gas to be burnt correctly. It also removes the remaining burnt gas after the combustion process is complete. The boiler has safety parameters in place to make sure no gas can be passed through to the main burner if the fan has ceased functioning
Supplier Part Number: 180901
Vaillant ECOmax 665 (2006-2008)
Vaillant VU 656/4-5 (2007-2010)
Vaillant VU 656-7 (2006-2008)
Technical specification
Waist Sizeaa27ci57gtSupplier Part Number180901Brand NameVaillant