TESTED SYSTEM NOT HEATING FOR WHOLE HOME. UNIT HAS 3 ZONES FOR U/S, MAIN, & BASEMENT. FOUND NUMEROUS ISSUES INCLUDING A 1P SWITCH THAT IS FAILING TO POWER FURNACE, BYPASS DAMPER SET OPEN PERMANENTLY, & POOR OVERALL DESIGN. SYSTEM IS LACKING PROPER DUCTWORK FOR THE UNIT TO RUN PROPERLY. NOT ENOUGH RETURN AIR TO UNIT & WHEN ONLY ONE ZONE IS ON THE UNIT OVERHEATS. THESE ISSUES HAVE ALSO CAUSED NUMEROUS CRACKS IN THE HEAT EXCHANGERS. SYSTEM IS VERY DIRTY W/ DUST/DIRT BUILD-UP & LACKING FLOOD PROTECTIONS. Based on our findings today, it might be time to think about getting a brand new system.