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Old 05-05-2011, 09:27 PM   #1
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Have Heat but ac wont come on


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?

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Old 05-05-2011, 09:31 PM   #2
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Have Heat but ac wont come on


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Originally Posted by quickbrad View Post
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?
Yes. Are you saying the compressor is running in cool mode or not running?

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Old 05-06-2011, 04:44 AM   #3
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Have Heat but ac wont come on


When in heat mode, did you actually see the outdoor can running and hear the compressor running, ot did you just check for warm air at the registers?
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Old 05-06-2011, 11:51 AM   #4
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Have Heat but ac wont come on


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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Old 05-06-2011, 11:54 AM   #5
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Have Heat but ac wont come on


Compressor is not running in cool mode. I have air coming from vents but its just room temp air. No matter where i set the stat, the compressor will not come on in cool mode.
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Old 05-06-2011, 02:54 PM   #6
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Have Heat but ac wont come on


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.
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Old 05-07-2011, 05:40 PM   #7
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Have Heat but ac wont come on


low pressure?
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Old 05-07-2011, 05:49 PM   #8
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Have Heat but ac wont come on


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low pressure?
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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Old 05-08-2011, 06:40 PM   #9
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Have Heat but ac wont come on


have you changed your thermostat recently and now you have a problem

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