Pictures: http://imgur.com/a/PuT6a
Disclaimer: I know very little about HVAC, so I will make up a lot of the terminology, hopefully it makes sense.
Story: My thermostat has been working spottily for the last month or so, which I attributed to just having a faulty thermostat. My apartment keeps temperatures pretty stable, so it didn't really bother me in the spring, I mostly noticed that the fan wouldn't always turn on.
However, with the last few days being extremely hot, I have discovered that central air (hot, cold, and fan) doesn't work at all.
Long story short, I discovered that the red 24VAC wire does not have voltage at the thermostat plate. Tracing the path of the wire to the control HVAC control board, I saw that while all the other wires go directly to the control board, the red wire ties into a yellow wire, which goes down to the bottom of the unit to that weird device in the pictures. The yellow wire then comes back up, ties to the red wire again, and goes to the control board.
Removing the wire caps tying the red and yellow wire together and measuring the voltage, I can see that wire going from the control board to the device has voltage, but the wire going from the device to the thermostat does not. This makes me thing that what ever this device is, its malfunctioning is what is causing my central air to not work.
Does anyone know what it is? A flood sensor, an FBI tracking device, a weird surge protector?
To be clear, the yellow wire is just some wire going to and from the device, it is unrelated to the AC wire on the thermostat.
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