Vaillant Eco Tec Plus & Pro Main Heat Exchanger Thermal Fuse Sensor (F76 Fault) flue duct ensure that you add the

ensure that you add the weight of the water that will be contained inside

ECOFIT PURE 835 COMBI VUW 356/6-3 (H-GB)

They are used when sealing pipework to other parts within the boiler

Boost Function

Vaillant Eco Tec Plus & Pro Main Heat Exchanger Thermal Fuse Sensor (F76 Fault) flue duct ensure that you add theWhat these parts are F76 Thermal Fuse Thermal Fuse Sensor a safety device fitted on near the main heat exchanger on Vaillant Thermal Fuse Sensor Ecotec Plus Main Heat Exchanger and similar parts. It detects overheating and will trigger an F76 fault code if temperatures exceed safe limits to protect the boilers heat exchanger. About the F76 error The F76 fault code means the overheating protection on the primary (main) heat exchanger has responded