Upon my arrival I performed a 6 months checkup on 1 heat pump systems. I cleared and treated the water removal system, washed the condenser coil with water, cleaned and treated the electrical cabinet with electrical insecticide. I found they systems performance to be operating with in manufacture specifications at this time. During the evaluation I found that the safety side of the system needs some attention. The auxiliary float safety switch is faulted not shutting the system down when it is tripped and the system has bacterial growth starting inside the air handler. I spoke with the customer about my concerns and he would like the options emailed over to view.