AC Trouble

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Old 10-11-07, 04:36 PM
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AC Trouble

I am having problems with my ac unit. It is an older one and I can not get product info off of it. The air will come on for a few minutes, then it starts blowing warm air. If i turn it off, then turn it on back on after the fan turns off, it will blow cold again for a few minutes, then warm again. any ideas on what the problem could be? Thanks so much!
 
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Old 10-11-07, 05:12 PM
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Ok lets do a few tests on your unit.
1. If this is a Heat pump system lets turn off all power then pull off and isolate the wires off the t-stat that got to w2 and aux to eliminate the possibility of the t-stat pulling in the aux heat and overiding your nice cool air. If this works you need to closely inspect every inch of your t-stat wire it probably has a spot cut or chewed and is shorting out.
2. If that does not help lets turn off all power now go to your tstat and pull off the Red Green and Yellow wires and tie them together, now power back up and your unit should start up and run. If it now continues to run and cool go ahead and replace the t-stat. If it still stops cooling after a few minutes move to next step.
3. Clean the outside condensor coils, then recheck with run test
4. Still no luck? Have someone turn the t-stat to cool while you stand right at the unit listen for any loud buzzing chattering or loud clicking noise see if you can hear the compressor when it starts and cuts off listen for any unusual sounds and report back soon.
5. if nothing above works for you we will need to do some perform some voltage checks and amp draw readings this will require some equipment and some electrical knowledge lets save that until the other items are checked out and done. Has your unit been recently serviced? any changes to the duct etc? please post back results.
 
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Old 10-11-07, 06:09 PM
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Thank you. I will have my husband try this in the morning and will get back to you asap. No, there has been no recent service to the unit.
 
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Old 10-12-07, 03:41 PM
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Wink

When it is running check the copper lines going into the condenser unit out door. Big one should be cold and wet the small one warm to hot all the time . Do you see and Ice or frost on the lines inside or out?
 
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Old 10-12-07, 07:55 PM
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No ice on the lines. it actually will run ok most of the night, it is just during the day that it won't cool.
 
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Old 10-13-07, 09:44 AM
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If your unit cools well at night but kicks off during the day when outside temps are high then I would suspect that you either have a nonoperational/intermittent outside fan or dirty outside coil. First check to make sure that the fan is working on the outside unit and the discharge grille is not blocked with something setting on top of the unit also check around the unit to be sure there is not something laying against the unit preventing proper airflow into the side of the coils. The fan in the outside unit must run when the compressor is on. If fan is OK lets clean that outside coil it is probably packed with dirt and that will cause the high side pressures to soar especially when the outside ambient temps are higher.
 
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Old 10-13-07, 06:58 PM
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yup I agree the unit running at night and then being affected by higher ambient temps during the day is a strong indicator of a unit kicking out on high pressure CLEAN THAT COIL
 
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