No cold air - HVAC issue
#1
06-29-14, 01:41 PM
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No cold air - HVAC issue
Another issue as per many on this forum.
Our upstairs unit has stopped cooling. I replaced the dual capacitor last spring.
This time, the outside fan is running and the inside blower fan is running, but no cold air. (last time, the compressor fan did not run). Could this again be the replacement dual capacitor but it has failed only on the compressor motor (is that possible)? Best method to check this? Is the compressor enclosed next to the fan in the outside unit?
thx
Our upstairs unit has stopped cooling. I replaced the dual capacitor last spring.
This time, the outside fan is running and the inside blower fan is running, but no cold air. (last time, the compressor fan did not run). Could this again be the replacement dual capacitor but it has failed only on the compressor motor (is that possible)? Best method to check this? Is the compressor enclosed next to the fan in the outside unit?
thx
#2
06-29-14, 01:54 PM
Group Moderator
The compressor is directly under the fan in most condensor units.
I have a capacitor meter for checking capacitors but for the price of the cap it's easier for you to just replace the cap.
I have a capacitor meter for checking capacitors but for the price of the cap it's easier for you to just replace the cap.
#3
06-30-14, 08:40 AM
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is it possible for the compressor portion of the cap to go bad and the fan still be OK?
My multi-meter does not measure capacitance. Since I have two units, I may swap caps to see if it fixes the issue. My concern is doing so will somehow damage the good cap.
thx
My multi-meter does not measure capacitance. Since I have two units, I may swap caps to see if it fixes the issue. My concern is doing so will somehow damage the good cap.
thx
#4
06-30-14, 08:53 AM
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#5
06-30-14, 09:57 AM
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It is not uncommon for half of a dual cap to fail. A new dual cap should be installed when this occurs.
Uni T offers a $25 pen type meter that I use several times a day that measures up to 300 uF caps, voltage and ohms.
I bought it as a supplement to a Fluke 902 that has a poor ohm meter .
Uni T offers a $25 pen type meter that I use several times a day that measures up to 300 uF caps, voltage and ohms.
I bought it as a supplement to a Fluke 902 that has a poor ohm meter .
#6
06-30-14, 10:38 AM
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I swapped caps and it solved the issue. Found a local supply shop that has a replacement.
Not happy this failed in 2 years (evidence of a bigger issue?) but pleased that was the only problem.
Not happy this failed in 2 years (evidence of a bigger issue?) but pleased that was the only problem.
#8
07-01-14, 05:36 AM
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I guess I'm having the same issue...my outside unit runs..my inside unit runs..but I'm not getting cold air..the outside unit occasionally makes a 1-2 sec hum..would this be a capacitor?
#9
07-01-14, 05:40 AM
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It is usually the cap or the wire between the cap and the compressor start terminal is melted at one end.
#10
07-01-14, 05:42 AM
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#12
07-01-14, 05:46 AM
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