[Help Please] Ecobee3 Installation

Hey guys, I recently purchased an ecobee3 to replace my PSG Medallion (model number: TDMP24-AH11).

The original wiring on the Medallion has the red wire going to Rc and a jumper going from Rc to Rh. There’s a white wire going to O and a yellow wire going to Y1 with a jumper wire going from Y1 to W1. B is left floating (no wire connected to it).

As you can see from the pictures, the Medallion is battery powered so there’s no C wire for the thermostat. For this reason, I’m using the Power Extender Kit (PEK) that came with the ecobee. I hooked up the red wire to the R/Rc/Rh port, the green wire to the G port, and the yellow wire to both the Y1 and W1 ports (I soldered a junction).

I hooked up all the wires accordingly with the PEK R wire going to Rc and the white wire going to O/B. I turned on the thermostat power from the breaker and it booted up just fine. The setup asked me if Rc or Rc & Rh were connected, so I chose Rc & Rh since I was using the PEK.

The setup then showed me what wires it detected and found only Rc, Rh, Y1, W1, O/B, and C, which is strange because G wasn’t detected. I took out my RMS multimeter and measured the AC voltage from R to C on the ecobee and it was a round ~23.97 Vac, which the installation guide said it should be 24 Vac.

It is worth noting that sometimes the unit would start making clicking noises and reboot, or the touch screen would be unresponsive (which are signs that not enough power is being fed into the unit, according to their FAQ).

Confused, I reconfigured the wires again, this time plugging the white wire directly into W1 on the PEK and the ecobee detected the correct wires, however, after setting up, nothing would work. In the testing mode, nothing would power on (AC, heating, fan). I checked all the wiring using the continuity feature on my multimeter, and strangely enough, everything checked fine.

I’m at a loss here and I would really like to get this working, so any ideas are welcome! I also want to mention that I have unused light blue and brown wires, which according to some digging, is commonly known as 2nd stage cooling and heating, respectively.

submitted by /u/michaelnkang
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