Responded to no heat complaint at customer's café. Diagnosed York furnace showing fault code 57 (pressure switch failure) that persisted even in fan-only mode. Found severely clogged 14x14x1" filter that customer was unaware of, significant water accumulation around unit from leaking water heater, and evidence of multiple previous repairs. After unsuccessful attempts to jump terminals and power the blower with 24V, customer was advised to contact plumber for water heater leak and schedule follow-up for either component replacement or full system replacement consultation.
