Hello all this is my first visit and post. Im sure you guys can help so heres the problem. I have a heat pump, (package i guess, its all outside). Im not a pro at this hvac stuff yet, but can change stat, capacitor and motors and such, but am confused about this. I can turn the heat on and the unit runs fine, no issues at all with heat. When i switch to ac, I get nothing but the blower fan in the unit. If the capacitor was bad, wouldnt it stop the compressor from running in the heat and ac position? :confused1:
Have Heat but ac wont come on
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Yes. Are you saying the compressor is running in cool mode or not running?
Yes i can see and hear that the compressor is running in heat mode. Also I have hot air coming from the vents. It just will not run in cool mode, only the blower fan runs, I have room temp air coming from the vents, and the compressor or fan do not run. Its very confusing.
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The call/signal for the compressor to run comes through the same wire for heat as it does for cooling.
Its possible that your unit has a low pressure switch, and its shutting the outdoor unit down in cooling mode because the pressure is too low.
Its possible that your unit has a low pressure switch, and its shutting the outdoor unit down in cooling mode because the pressure is too low.
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Low refrigerant pressure meaning low on refrigerant as in possible leak. Protection for the compressor so it doesn't run dry and burn itself out.
Refrigerant level needs to be checked to determine if that is a possible cause.
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