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Old 09-25-2011, 11:08 AM   #1
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I have to shut off breakers on central a/c unit, wait 1hr. then turn the breakers back on to be able to start the a/c. What is wrong? The temp. here in NewHampshire is in the 60's to 70's. The a/c runs at night when set at 65. Then will not turn back on again unless the breaker shutoff is repeated.If the coolant is low, would that cause the compressor overheat? Is the outside unit fins dirty?


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Old 09-25-2011, 11:46 AM   #2
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For lack of information, it appears that the compressor is heating and making open the internal safety switch

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Old 09-25-2011, 12:01 PM   #3
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next time it runs go out on the condenser outside and grab the thin copper line coming out should be slightly warm but not hot it's right next to the black insulated one..that should be cold and wet....and tell us the fan is blowing into your face hot when you look into that condenser...your either locking up on a safty or as said tripping comp internal on heat ...where it is coming from is the mystery....we'll see what state are you in ...how is the days temp there the worst thing if the fan is blowing strong condenser needs a goog hose wash from the inside out

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Old 09-25-2011, 12:07 PM   #4
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I am in New Hampshire. The temps have been in the 60's. What would cause the compressor to overheat? I've had the system for five years only
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Old 09-25-2011, 12:21 PM   #5
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Check if the outside coil is dirty
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Old 09-25-2011, 12:23 PM   #6
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60F is cool if the condenser fan motor short cycles the heat would go right back into the compressor....and trip a metal disc as it should.when it is reset does it cool the house till the stat satisfies...

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Old 09-25-2011, 12:28 PM   #7
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Seems to work through the night, but in the morn when tun up the temp to 70, it will not come on again unless I shut off the breakers and turn on again after 1 hr.
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Old 09-25-2011, 12:45 PM   #8
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shut the unit off and then go out to the condenser and kill the disconnect out there and remove the top fan motor will come out withthe top section slide it over and hose the coil inside out..keep it minimum don't need to blast it ...especially from the bottom coils to 6" up then restart....might have to get a service guy in,but try that first!the days temp is doing something to it even that morning temps(sun hitting it in the AM) but night run is good cool and no sun effecting it...
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Old 09-25-2011, 01:08 PM   #9
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Is this a heat pump?
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Old 09-25-2011, 03:29 PM   #10
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I went and did as you said. Cleaned the coils out real good. Then hit the breakers again and the air did not come on. I'm waiting 1hr. and trying again. Might have to reset itself.Had an electrician tell me sometimes takes 45min. to 1hr. to reset itself.
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Old 09-25-2011, 03:47 PM   #11
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Chek the refrigerant levels, not coolant. The refrigerant, again, not coolant as that is what you put in an auto vehicle radiator, contains oil. That oil could be low and as with anything mechanical when lack of oil is present overheating (and seizing up) is as well.

You could have tripped pressure switches.

Keep it on one thread. I might as well tell you before a moderator does.
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Old 09-25-2011, 04:10 PM   #12
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Thanks for the heads up on the thread. Didn't know. Where do you check the oil level.
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Old 09-25-2011, 07:46 PM   #13
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Quote:
Originally Posted by abessette.1 View Post
Thanks for the heads up on the thread. Didn't know. Where do you check the oil level.
Refrigerant gauges are needed. The oil is a part of the refrigerant.
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Old 09-25-2011, 09:15 PM   #14
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Thank-you Doc Holiday. Calling in pro tomorrow. Messed around with this long enough. Don't want to permanently screw the unit up. Andre
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Old 09-25-2011, 10:23 PM   #15
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Quote:
Originally Posted by abessette.1 View Post
Thank-you Doc Holiday. Calling in pro tomorrow. Messed around with this long enough. Don't want to permanently screw the unit up. Andre
No problem, thats why we're here. Please let us know the outcome.

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