arrived to find system starts up blower motor ramps up makes something noises at each stage and then kicks off after reaching high stage. not tripping limit runs for approximately one minute. reached out to train tech support went over symptoms diagnosed failed in ECM blower motor. part available locally, ran to get parts returned and installed. system operating at this time no thumping noises. did identify inadequate duct sizing for return drop. product is 20x10 allowing only 1060 CFM. 100k BTU requires minimum 1300 CFM. customer also has 1" filter, spoke to customer about upgrading filtration to Aprilaire 2210 for filter that only needs to be changed once a year. will follow up with pricing to address duct.
