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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8326
Experience:  Furnace, A/C and heat pump specialist.
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My A/C compressor always turns off after a few hours, About

Customer Question

Hi, My A/C compressor always turns off after a few hours
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: About a month
JA: Do you plan on doing the work yourself?
Customer: I would like to but I also want to make sure I have a working AC
JA: Anything else we should know to help you best?
Customer: The unit is pretty old about 17 years old
JA: Did you double-check the thermostat? And what about the unit's filters?
Customer: yes and the filters are clean
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Are you saying unit is shutting off before setpoint on thermostat is reached and if so, both indoor and outdoor or just one or the other?

Customer: replied 1 year ago.
The indoor fan continues to run. The outside compressor shuts off, strangely, around the same time everyday no matter the setpoint on the thermostat
Expert:  airheatman replied 1 year ago.

OK there are several things that could be going on.

1.Shutting off on high or low pressure

2.Float switch in drain cutting off the 24v to unit

3.Thermostat problem dropping out thinking temp has been reached

4.If unit has a utility company box mounted beside unit, power company may be disabling unit

Lets tart with that utility company box. Some customers agree to have a box installed that allows the power company to disable unit certain times of day to reduce load on power station and in return get a break on power bill.Do you have such a box?

Customer: replied 1 year ago.
No, I don't have a utility company box
Expert:  airheatman replied 1 year ago.

We may have to troubleshoot when it is off and should be on.Do you have a meter for checking voltage and are you home and available during the periods it is acting up?

Customer: replied 1 year ago.
I am but its dark outside now. Can we resume this conversation tomorrow? I can't see anything outside
Expert:  airheatman replied 1 year ago.

Yes, I am here most every day. When it is off and should be on, lets start by checking to see if we are losing the 24 volts from inside at the condensing unit.WE will go from there.

Customer: replied 1 year ago.
Thank you!
Expert:  airheatman replied 1 year ago.

Look forward to helping you figure this out.