3 system tune up Cleaned mini split. System delta and components are fine. No your codes Recommend surge protection to prevent premature failure Main house systems Efficiency loss due to dust build up on coils and blowers Biological growth present in both systems in large amounts No P traps on secondary drain lines of either system The delta on the upstairs system is too high due to air flow restriction on the return side 2 ton air handler needs 900 CFM of air and currently only had 500 All other company's are testing in limits and operating correctly