Hello, a few days ago I bought a mobile compressor brand Ferrex from Aldi-Süd. I only need this one a few times in the summer to clean devices. Never had a compressor. Operating instructions read out completely. Blow-out adapter attached. Switched on. After 5 minutes no pressure is indicated on the pressure gauge (?) although the device is leaking. A few loosely lying dust grains can be blown away on a table already 1 m. I turn off the comp. and let the air out, I hear max. 1 sec. a slight hissing. A kind of pressure reducer or so there is no, so can not be switched on. My Kärcher high-pressure cleaner brings after much shorter time power. Can someone give me a tip, or is the device defective? Thank you.