Upon arrival client mentioned that system has not been cooling. Checked 3rd floor “Back Unit” delta T , supply at room temperature, checked filter ok, checked hydro coil noticed coils were hot to touch. System may have been running in heating mode earlier today. After switching off system & turning back on checked delta T again noticed system is now cooling properly. Checked refrigerant pressures ok system has good pressure, checked airflow in bedrooms ok, Must return to perform Maintenance on Hot Water Boiler. System is currently operational and cooling well at this time. Informed client to contact us if she encounters any issues with unit. Follow Up Action: Perform Full Maintenance on Hot Water Boiler. Reviewed work completed with client, emailed work summary.