Homecare inspection. Checked electrical components, checked ductwork, checked safeties, checked blower wheel and cabin, flushed drain, added safety switches, taped up broken flue until we can get back to replace it, tested operations at thermostat. Found broken 10 inch flex run, unable to access flex and pull it out enough to reconnect, wall may need to be cut open inside or in utility room in order to make repairs. Flue vent pipe being single wall is still code in this situation but pipe itself has a crack in it. Need to replace 5ft piece of 4 inch single wall pipe and 4 inch elbow. Collected deposit for safety switches today, advised customer the rest will be collected when job is complete. Plumbers moved water heater in order for hvac to make repair so we need to return tomorrow, customer agreed to not have hot water until work is done. Completed Homecare today.