Hello,

We live in Santa Monica, CA and rarely use our AC or heat. We have a split system with the heat pump condensing unit on the roof of our condo complex and the air handler is in the closet in our condo. I replaced our old manual Thermostat with a new Honeywell Digital/Programmable thermostat. When I turn the Air Conditioning on now, warm air comes out of the vents in our home. I went on the roof to check the Heat Pump Condenser Unit and cold air is shooting out the top of the unit, and with not much force. Normally I think that warm air shoud be coming out of here right? I think that maybe the fan is spinning the wrong way, but I don't know enough about these things to diagnose.

I have read so many things on the internet that I am not sure what is right. I read one answer that stated that I might be out of refrigerant, but how would I create cold air in the unit without refrigerant. Anyway, any ideas or know how would really help!

Matt

If in heat and it blows cold the revering valve signal is backwards.

Not enough info.

Switch the setting to heat or raise the desired temparature setting to see if the units goes into the cool mode. If so then try to figure out which wires are for cooling and which are for heat. Check wire connection in air handler.

Check the wire going to the reversing valve, it should be orange, and if you put it on the O (heat pump reversing valve powered in cool) on the new thermostat try putting it on the B (heat pump reversing valve powered in heat) on the thermostat.
You also must have a thermostat that has a O and B, a regular AC thermostat will only have R(Rc/Rh), G, Y, W.