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I've been having issues like the heat pump not heating. Now that it's hot outside, my A/C isn't working. Can someone tell me if my Nest thermostat is even wired correctly?

Thermostat

Heatpump

Heatpump2

If it helps any, here is how the original one was wired and it worked just fine.

Original

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  • Those are the outside heat pump connections, the thermostat will be connected to a control module, usually on or next to the indoor vent/heat unit.
    – Stavr00
    Apr 13, 2018 at 17:26
  • @Stavr00 I have a crawl space so I got under the house and looked at the furnace but didn't find any wires. I also traced the wires running from the outside unit, into the house, and they don't appear to be running with the other piping. I don't know if they go up the walls? I guess I don't know what I'm looking for. There are two panels on my furnace, the switches/breakers, and the filter access panel.
    – hack3rfx
    Apr 13, 2018 at 17:33

1 Answer 1

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Here are things to check first: - Check the 220V breaker serving the heat pump. - Check the over-pressure valve breaker on the heat pump.

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  • No breakers seem to be thrown. When I turn the A/C on, it does blow air out. It's just not cold. My heat works too, or at least my AUX heat does. Heat pump is questionable in performance. Also, I don't know where the pressure valve breaker is at. I looked at the switches on the furnace under the house, they're both ON. There's a box attached to the side of my house, which has a big wire loom running into the outside unit. It just has a black pull-type lever in it. Not sure if that's what I'm looking for. Or, is the pressure breaker inside the outdoor unit?
    – hack3rfx
    Apr 13, 2018 at 17:51
  • You can try to jump R to Y on the heat pump unit to see if it'll turn on (careful not to get sliced by the fan blade!) Leave it on for a few seconds. but don't do it repeatedly or you risk burning out the compressor.
    – Stavr00
    Apr 13, 2018 at 18:29

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