Hello, the metering device is restricted with dirt, debris or ice.
Tell me the head and suction pressures, and the exact outside and indoor temperatures taken at the very same time. when charged with 10 or 11 lbs of refrigerant.
click here for the pressure temperature chart that includes R 407c.
with the room at 72F the suction pressure should be no lower than 51.5 psig if the suction line is longer than 25 feet, and no higher than 54.8 psig if the suction line is shorter than 15 feet
I am a retired mechanical engineer and HVAC/ electrical/ refrigeration and boiler contractor ... with 56 years in this business. The last 20 of those years consulting for major firms nationally..
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We can go from there.