R410A All DC Inverter V5 X Series 50Hz      MCAC-VTSM-2015-10 
158 Troubleshooting 
If the oil has been spoiled 
 
   
The compressor can’t be lubricated effectively. 
The electric heat will rise and the temperature of the motor becomes increasingly high 
Leads finally to compressor burnout an damage 
The scroll plate, the crankshaft and the compressor bearings will wear 
Abrasion leads to larger load, higher current 
A normal 
compressor bearing   
The bearing is seriously worn, 
and completely damaged 
A clean filter (on the suction 
pipe of the system) 
The filter is blocked by impurity; the 
compressor suction will be abnormal