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Give me the model on your outdoor unit and tell me exactly what is going on and if anything has changed since it was working properly such as thermostat settings or wiring.
OK your unit is made by ICP so it reverses in the cool mode. Do you have a meter so we can do some troubleshooting.If unit is not changing over to the cool mode we have one of 3 problems.
1.Reversing valve solenoid is not getting 24 volts
2.Solenoid is defective, getting voltage but not activating reversing valve
3.Reversing valve is bad and not swishing from heat to cool.
None of these justify having to replace unit.
We would need a meter to troubleshoot. If you have a meter let me know .If not you can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.
Sounds good we will go from here. Do you know what the reversing valve solenoid looks like?
I will guide you.It will be red or burgundy attached to reversing valve and have 2 wires going to it.
It will be inside of the outdoor unit .If you can attach pic of inside of the outdoor unit I will point it out
Sounds good.Our first step will be to locate the wires from this solenoid.Turn ac to cool mode and check between the two wires for 24 vac.We will go from there.