1.Install gauges and check operating pressures.
2.Check voltage and amperage to all motors with meter.
3.Check CFM across evaporator coils.
4.Check for adequate refrigerant charge and possible leak.
5.Check evaporator superheat.
6.Lubricate all moving parts.
7.Check belt and adjust tension.
8.Check and/or change filter.
9.Check pressure switch cut-out settings.
10.Check start capacitor and potential relay (if applicable).
11.Check compressor contactor
12.Check all wiring and connections
13.Check and adjust thermostat.
14.Check condensing coil.
15.Check that condensing drain is open