Turned all systems on. When they turned on, they were showing a communication error code. Checked the outdoor unit. Turned power off for 3 minutes then turned the power on. The condenser went through the checks and started. Checked the pressures in cooling. Lo side- 62 psi. The system was low on refrigerant. Added 1 lb 5 oz to the system. Checked the fittings and the evaporator coils for UV dye. The upstairs bedroom in front, there was dye on the back side of the coil. Recommend replacing the indoor unit.