[sebmaldonado]

I need some help figuring out what is wrong with my A/C unit. During the summer I had problems with the unit not cooling. I had a service technician come out and he found that the unit was low on refrigerant. He charged the system and it worked fine.

Recently I am having the problem that the unit does not turn off when it reaches the desired temperature. If I set it to cool at 76 degrees when it reaches that temperature it does not shut off and the air coming out of the vents is starts coming out warm . When I manually change the thermostat to off, sometimes it turns off sometimes it doesn't. We recently started seeing some cold days in the south and I switched to the to heat and it does the same thing.

What I end up doing is turning the unit off at the circuit breaker. Sometimes this sort of resets the unit and it works fine for a couple of days but eventually it gets "stuck" again.

I mentioned this to an HVAC store and they mentioned that the relay on the inside unit might be getting stuck.

Any help would be greatly appreciated.

[hvac1000]

It is possible you have a defective relay which will give the symptoms you describe. Look on the drawing that should be on the blower door and see if there is a blower relay listed. If so I would get a replacement. Make sure you mark any mires before removal. Also turn off the electric power before servicing.

I was also a bit confused on your post. Does the outside unit keep running also? You mentioned that in the beginning of your post. I would also like to ad that is the serviceman did not fix the leak before he added refrigerant the problem will come back.