Took too many service visits to get it right
Had severe evaporator coil leak in end of June just when our 100+ degree days started. Initial diagnostics service call scheduled on 2nd business day. On that time tech confirmed coil failure and system was still under warranty. I was told coils are backordered and no estimate of arrival date was given. After almost two weeks I got call that the coil had arrived. We scheduled the install for 2nd business day from the time of call. Two techs showed up and completed the coil replacement and refrigerant charge within about 2 hours. System was verified at the time to be working "normally". I took a picture of the new coil label to attempt registering for warranty, only to find out the coil was already registered with Carrier about two months ago? Did I get a used coil installed? After couple days running I noticed that the system was not running as good as before. Our master bedroom was getting hot in the afternoons. I verified with FLIR thermal camera that the air coming out of the bedroom register started cool at first but after running for 15 minutes or longer the air start to get warm. If system was running longer eventually the bedroom register air temperature become same as the air return. To fix that the system had to cycle after which we got another 15 minutes period of cool air. A service call was scheduled to investigate the issue. Tech was not believing it is air temperature issue but thinking it is air flow issue. Tech said he saw some issue with the blower motor and ordered replacement blower motor. New blower motor arrived within couple days and install appointment was made for 2nd business day from the time of call. Tech Jose Galvan arrived in the afternoon when it was over 105F outside. I cannot believe anyone can work in the attic on such hot day! Jose replaced the blower motor and things appeared to work normally, except that the bedroom register blowing cool first but warm air later problem was still present. Jose was the first tech I talked that took seriously my concern and looked into the problem. After taking some measurements he concluded that the previously replaced coil TXV was bad or the coil was bad. He placed an order for a second new coil. This time the second new coil arrived in less than a week! Coil install was scheduled for 2nd business day after the call. Now after having the new coil (different part number from previous) installed and run for full day I can confirm the AC finally works as good as new. I registered the new coil with Carrier and got the warranty date starting from the date of install. (So this clearly was a brand new coil, unlike the earlier one was a used part?) The justification for 3\-star review: The whole process took too many service visits. Also many of the techs seems to have "we are professionals and we know better" attitude. The first replacement coil already being registered for warranty couple months before makes me suspicious what was the story behind it?