HELP!! I've pulling me hair out!! Carrier 40aq Air Handler. Original prob was air handler lost 24 volt output. I replaced transformer with a slightly undersized one... 40va instead of the spec'd 60va... and it ran for about 10 minutes.. then blew. Now I put in a new 75va transformer... and it ran...

Which is a better system, Carrier Comfort 14, Puron, 3.5 ton, single stage, 16 SEER, air conditioning and heating system, condenser model 24ACB442A003 to new refrigerant lines using Carrier evaporator coil model CNPVP6024ATA, ON TOP OF A CARRIER iNFINITY VARIABLE SPEED GAS FURNACE MODEL...

I have a transformer that is 120/24 one side of the transformer going to the board is reading 24 volts like is supossed to the other side going to the control board is only reading 8 volts I don't know what the problem is

First I would like to say, Hi to every one on this site. Seems like I can get all the help I need. 2nd my Question. I have a carrier furnace, Model no 58MSA trying to locate the transformer but I don't see it. If anyone knows please help me. Thanks.

Last week my air handler quit working, I found that the 5AMP fuse for the secondary 24volt pwr supply was blown, replace and all worked fine for a week. Now I find it blown again, but each time I relace it it blows, The voltage reading I get at the fuse is 29.5 V is that to high? The transformer...