Responded to service call for 2-year-old heat pump not heating properly. Diagnosed multiple issues including continuous air handler operation triggered by steam humidifier calls, condensate drain leakage near garage air handler requiring replacement fittings, and client confusion regarding thermostat operation in this complex system. Return visit scheduled to complete annual maintenance service on boiler, air handler, and steam humidifier, and to install new humidifier canister and repair condensate drainage system.