Check refrigerant chargeCheck air filters, clean if necessaryCheck indoor and outdoor coils, clean if dirtyCheck electrical connectionsCheck running voltageCheck and flush condensate drainInspect contactor pointsInspect capacitorsCheck amperages of motors and compressorCheck temperature split across evaporator coil | Check refrigerant chargeCheck air filters, clean if necessaryCheck coils, clean if necessaryCheck electrical connectionsCheck voltage and amperage of motors and compressorLubricate fan motorsCheck fan blades for tightnessCheck amp draw of electric heatersCheck 1st stage heatingCheck 1st and 2nd stage heatingCheck low temperature cut offCheck defrost initiation and termination |