Performed ac diagnostic, found system very very dirty. Can’t get accurate refrigerant numbers it’s so bad. Need to clean coils and then test for proper refrigerant charge Performed ac tune up per membership cleaned coils then tested system. Found system low charge. Need to charge system and recommend dying system with us dye so we can find leak when it goes low again. Add refrigerant and Dye to system to find leak if it goes low again. Charged system as best I could for cool raining day. System kept going into standby mode. But got refrigerant above freezing. Clients to call in if notice it’s not cooling again. Also need to look into outdoor temp sensor that broke.