Ancar SD-150 Dental Treatment Unit

[@ranymatar2068]

Hello I installed an Ancar Sd 150 3 years ago (2018) in my dental cabinet . This year i faced a problem in it : suddenly the air pressure on turbines became so poor and sometimes stopped . All the other functions are still working. Could you please help me to fix it ? I asked already the technician responsible of it but didn't find the solution