Sime Air-Gas Hose Kit 6278856

The Sime 6278856 air-gas hose kit is a manufacturer-supplied hose assembly used on Sime Format DGT HE and Open DGT HE gas boilers. It carries the air and gas path between the boiler's components as part of the combustion air and gas supply arrangement. The kit is listed by Sime under the part number 6278856.

• Visible cracking, splitting or perishing of the hose material
• Hardening or brittleness where the hose has been exposed to heat over time
• Signs of gas or air leakage at the hose connections, such as a smell of gas or a detected drop on a tightness test
• Combustion readings drifting outside the expected range, or unstable flame characteristics
• Loose or damaged hose ends that will not seal correctly on the spigots

• Confirm the boiler model against the fitment list, as the kit covers specific Format DGT HE and Open DGT HE variants
• Check the appliance data plate and any existing part number on the boiler before ordering
• Inspect the hose routing and connection points on the appliance so the replacement can be fitted and sealed correctly
• Confirm whether the boiler is a GPL or MET variant, as the fitment list distinguishes between them