I have an eEcobee3 I've been trying to get working with my HVAC. The HVAC is a heat pump, with the air handler in the attic. The current thermostat is a RiteTemp 6025. It's currently wired up at the thermostat the way the RiteTemp instructions say (the C wire is present and hooked up), except that the W wire from the air handler is connected to the W2 terminal on the thermostat, and the Y wire is interrupted by a float switch for the drip pan. The RiteTemp operates as expected: cool air when the temperature goes above the threshold, warm air when the temperature drops below the threshold. enter image description here

This is how Ecobee says it should be hooked up with AUX heat. enter image description here

This is how the RiteTemp is actually hooked up. enter image description here

This is how the wires are hooked up at the air handler (the fat yellow wires connect to the skinny yellow wires from the bundles and go to the float switch): enter image description here

(I understand the Y wire triggers the condenser, so presumably the float interrupts the yellow connection to kill the HVAC if the pan drain gets clogged and overflows.)

However, when I hook up the Ecobee following the Ecobee instructions, I get hot air when I should be getting cool. I'm wondering if the fact that the W wire is connected to W1 at the air handler and W2 at the thermostat is messing things up. But the RiteTemp works as it should, so...? Is there a reason the white wire would run from W1 at the air handler to W2 at the thermostat?

  • If you try to turn the regular heat on, do you get cold air? – ThreePhaseEel Jun 25 at 0:39
  • No, I got hot air. – Huesmann Jun 25 at 15:06
  • What make and model is your heat pump's outdoor unit? Also, which of the O and B terminals on the old thermostat had a wire hooked to it? – ThreePhaseEel Jun 26 at 0:06
  • Carrier 38YRA, connected to O. – Huesmann Jun 27 at 2:41
  • Your Ecobee should have a setting that controls when the O/B wire is energized. Have you tried flipping it yet? – ThreePhaseEel Jun 27 at 3:34

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