Warm air in cooling mode usually means that the thermostat needs to be set to energise the reversing valve in cooling. To do this is simple just by opening the stat and moving the selector switch to o. Everything else will wire color to color. r-r, g-g, y-y, o-o, w-w and brown. If you want the heat strips separate wire brown to emergency heat on thermostat.
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The fact is, the air handler supplies the voltage, blower, and electric heat. In order for the heat pump to work correctly, the wiring from the thermostat and heat pump need to be hooked up right to the air handler. The thermostat is what tells which component to come on. If the fan stops, but the condenser keeps going, you either have a faulty fan relay on the air handler, faulty thermostat or wiring, faulty wiring at the heat pump, or the contacts on the new unit are sticking, which is highly doubtful considering it is working now. I hope I have helped you understand this a little more. Good luck and don't let them push you around, get someone that knows what they are looking at.
The brown wire on a Goodman is tipically for the emergency heat option on your heat pump. First thing I would check is making sure it is wited correctly. Verify your stat is heat pump capable. Many of the cheaper stats only work for ac or just a heat pump. Anything beyond that would be a more serious electrical problem and should be looked at by someone with the proper training and tools.
Depending on the size of your Electric heat you can use one set of wires because your unit does not run with the heat like the heat pump. The large set of wires going to the electric heat should be used. You may have to jumper a new set to the contactor. On Goodman unit come in L1 and L2 jumper to contactor. Very simple good luck. Rus
You will need a refrigerant recovery machine, and an EPA certification to recover refrigerant. You will need an oxy-acetylene brazing set-up as well as a nitrogen tank and regulator set-up. You will need a set of refrigerant guages (make sure to get guages for the r-22 you will be removing and another set for the new r-410a going into the heat pump), a digital micron guage and a vacuum pump.
You may want a digital multimeter and control and power wiring supplies. You will probably need additional refrigerant also.
It may not be a good DIY project.
I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.