Fall pm 9/17/19 when I arrived I checked thermostat for and codes saw no codes. but when the customer is explain to me what kind of code or error they came up on the thermostat, as I did my p.m. inspection I noticed that outdoor condenser unit coils were dirty needed to be clean I recommend that get done today customer sign gave me a check for payment I will turn check in tomorrow morning also recommend UV lamp, Surge protection for the whole house. Customer will need a reminder to get these items installed once truck stock come in. I also did a return visit phone for a customer for these recommendations to be installed. I checked heat pump unit all components amperage electrical connections call for cool delta T 59 return 73 turn system off then called for heat delta T supply air 139 return air 75*