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Service call that the Heat Pump was not working. Upon arrival found thermostat set to heat and the indoor blower was running. Found the outdoor unit was out on Red Trip Code #4. Reset unit to test operation. After system ran for several minutes it began tripping out on High Head Pressure. Measured refrigerant and found system was overcharged. Removed 3lbs of refrigerant from the system to lower the head pressure. The Unit is charged with the refrigerant from the factory, and may have been overcharged. Measured air temperature readings and was measuring a 30 Degree Temperature rise. Checked Airflow and unit was running at 1,000 CFM for a 2-1/2 Ton System. Refrigerant pressures stabilized around 120 Suction and 385 Head Pressure. Cycled system upon completion.