Technician Quick Tip:
Check all obvious reasons for high suction first, excessive heat load at indoor coil, i.e.: heater running at the same time as the air conditioner, broken return air in attic that is sucking hot attic air into the indoor coil, metering device stuck open.
Proper refrigerant charge is crucial to the systems total capacity. If high refrigerant charge is suspected remove refrigerant in accordance with standard industry practices. Low superheat is an indication that liquid refrigerant not changing state in the evaporator and is possibly flooding back to the compressor. This can damage the compressor by liquid flooding into the cylinders and trying to be compressed. Remember compressors are made to only pump vapor refrigerant.