Advice needed. I have 2 carrier infinity units, 5 years old. Service man believes they were hit by lighting or power surge. Neither thermostate would light up, even thou they had power going to them. The board in the exchanger (hope that is the right name for the inside unit). had a yellow blinking light. After he removed the thermostat to check for power, he could not replace it with out blowing the 5amp fuse on the board. He found a burnt wire in the disconnect box. He cut off the end and replaced it. Out side units came on even thou the thermostat was disconnected. They said they cannot tell what parts are bad, and would have to replace them one by one untill every thing worked propertly (part A, and hope it would fixed, if not move on to part B. They would keep replacing parts, VERY Exspensive, until fixed. OR I could replace inside units and keep the outside units. This does not sound right to me. Is there no way to check each part and only replace the broken ones. Does Carrier have any one who could come and check the units. Now if I need to replace units I do not think I want carrier due to their POOR customer service, what brand do you recommend. Any suggestions will be greatly appresheated. :thumbup:I spoke with a carrier rep. when looking to purchase these units, all they would say is contact our rep. and gave me a name and number. I know I got a bad install, paid for heat strips that were not installed. No one from carrier would help me. He did not register the units for warrenty. When I fould out I got the information and registered the out side units and the thermosts, I did not know the inside units had to registed seperatly and carrier did not inform me of that so inside have no warrenty. I think Carrier sould know more about the people who sell their products as this man knew nothing and was a crook to boot.