When fan switch, short air pressure switch, can spark and light gas, and the normal combustion, thus determine air pressure switch is open, but has changed into two new flint. Doubt fan rotor binding, slow speed or pipe plug, make the air flow velocity is slow, cannot be sucked in air pressure switch. vdKservice manual download site
 vdKservice manual download site
Release pipe, try wind turbines no card lag phenomenon, speed is normal. vdKservice manual download site
 vdKservice manual download site
Open ceiling, found to have a smoke tube flattening sag (because of the smoke pipe thinner, exhaust steam heating the telescopic aluminum pipe, at the bending tensile force under the action of the sag), blocked part of the flue, will take off after smoke tube of commissioning to normal. vdKservice manual download site
 vdKservice manual download site
 vdKservice manual download site
Replace the original machine wind pressure switch, still can not be lighter. Although with the mouth suck air pressure switch, the multimeter can measure conduction, this is because when the suction mouth suck is larger, and the suction fan is small, it also suggests that the air pressure switch also cannot use. In air pressure switch and smoke tube, everything is ok.vdKservice manual download site