Came out today to perform one system HVAC service call. Upon arrival, customer stated that he had already had a previous technician out and that the unit was running when the tech was there after not running all night and then quit running again after the tech had left. Upon inspection of the unit found that the system had no power, this was due to the disconnect being melted due to a loose wire. Upon making repairs, started the system up to ensure proper function. Upon start up, system was running fine. Upon further inspection, found the blower wheel to be clean. All heating elements working properly. More further concerns there was no bypass damper, there was no UV protection, and no TE standard flood protection for the system. Also, there was no transformer for the zone system, all working off of one transformer. At this time customer chose Band-Aid repair option. System is up and running see estimate for further concerns.