Manual and semi-automatic coffee machine after the start of work, at the mercy of water is also normal, but the left hand suddenly noise very like motor that sound, I do not know who what position out of trouble?
May there discount on the water or natural water for a long time after the noise Bang nianye. Check search... The torrent source starts and filters the assembly.
Buzz like an electric motor. It's not like the water pump, because the right hand is normal.
With the tail water solenoid valve (Tie Bang) is a problem, remove the clean Nianye head installation
You tighten the solenoid valve fastening screw on the line, this is too simple, the reason may be a long time, and then caused by loosening
