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I just replaced the contactor and the AC is running perfect (and very cool, Yay). The coil on the old contactor is burnt and almost melted. I believe now I know what happened from the beginning that caused all the problems. When the unit stopped working last Sept, the control board must...

I tested the contactor as you suggested and there was no voltage on the T-stat wires. All four connectors on the contactor had 110 volts; is this normal? I cut power to the outside unit and tried to hear the relay click when the call for cooling was engaged but it just burnt the fuse; it never...

Bad news for me. Replaced the Thermostat wire to the outside unit and the fuse blew when I tried to start the AC. I know it’s not the wire because I first tried the AC without power to the outside unit and all was okay. I then raised the Temp on the thermostat, went out and powered the...

Thanks. Will replace and report.

Checked the wire that runs to the outdoor unit and the insulation worn out close to the unit. Any considerations in terms of what wire to use to replace it; outdoor rated, solid versus stranded, any voltage or resistance requirements, where can I get it (Home Depot, Radio shack)? Thanks.

I have attached part of the documentation that came with the unit. The furnace unit is a TUD080C936A. I could not attach the whole .pdf file because of attachment size restrictions on this site. I could email if you want/need all documentation. Maybe this will help.

I have a Trane Gas Furnace and AC unit. The wires to the T-stat are Green, white, Yellow and Red. There is a fifth Blue wire that is not used. At the controler board there are an extra couple of wires that I believe go out to the condenser/compressor unit. Here's a photo of both.

Hi hvactechfw and thanks for your insight. I checked the orange wire with my ohm meter and the wire is fine with no grounding to cabinet. However, the Valve switch it connects to reads ground no matter how I test it. It's a round vacuum activated/reading valve (photo attached) with 3...

Guess what? My same Trane unit would not start in AC mode last night. It worked perfectly all through the winter in furnace mode. I had no response when I switched to AC so I went and checked the control unit and the LED did not light up. The transformer is working because I can hear it hum...

Sorry for the delay and thank you to kok328 for his help in logically determining what was wrong with my system. As we discussed, I replaced the transformer and the control unit (the new control unit is fused) and the system is now working. Like to note that the fan speed is now lower but...

I was about to try that. Got a new transformer and the new control unit has a fuse for the transformer circuit. Will report after try.

Hi. I have a Trane gas heat/ AC unit thats about 18 years old. Untill 2 weeks ago it was working perfectly. Sudenly, it stopped working and nothing would come on. I checked the control unit and there was no power. My trane has a white-Rodgers 50A50-403 control unit. I bought a new 50A55-843...