Description:Electric Vacuum Machine has no suction: checking stepsFirst of all, make sure that the machine power indicator light is not on, whether the machine has the sound of the motor work; if there is a sound, the knob to the right to the bottom, use your finger to block the air inlet to see if there is suction, pressure meter has not changed.Specifications:Material: Plastic, PVC, PCColor: White, BluePower: AC 110VNoise: ≤ 70dB (A)Vacuum Gauge: 0-0.1MPa, Grade 2.5Working Mode: Short TermTemperature: 5-35°C/41-95°FInput Power: ≤ 90VA+25%Pumping Rate: ≤ 15L/3.96gal/minFuses: AC110V, F1.5AL, φ 5×20Storage Bottle: 1000mL/33.8ozPressure Regulation Range: 0.02MPa~0.07MPaEquipment Type: 7E-A, High Vacuum/Low FlowRelative Humidity Range: 30% - 75%Atmospheric Pressure Range: 700hPa~1060hPaPower Cord Length: 1.73m/5.67ftProduct Size: 30*16*27cm/11.81*6.3*10.63inPackage Size: 42*36*32cm/16.53*14.17*12.6inGross Weight: 5.15kg/11.35lbsNet Weight: 3.7kg/8.15lbsPackage Included:1*Portable Electric Vacuum Machine1*Hose1*Connecting Hose1*Backup Air Filter1*English Manual