Came out to call for a preventative maintenance on system. Customer changed filters recently and has no issues with how the system is operating. I inspected the condenser coil, capacitor, contactor and other electrical components. Checked amps, temperatures and pressures in heat pump mode. Cycled emergency heat as well and checked amps and operation of blower. System is a little over 2 years old and is operating properly within manufacturing specs. Discussed with customer about issue he was having with his upstairs mini split not heating. I checked the system over briefly and the unit will not switch to heat mode due to possibly being low on refrigerant again and can’t make the changeover. Customer wanted to schedule a time to come back out and look into it more to see what we can do to fix it. Happy Holidays!