Noise in the Contactor Relay in my A/C unit outside

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Old 05-05-13, 06:08 PM
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Noise in the Contactor Relay in my A/C unit outside

Hello, today I went to turn on my Home A/C after the long winter.
I heard a buzzing noise coming from the unit outside.
I opened the unit and I noticed that the noise is coming from the Contactor.
The a/c is working perfect, cool air and fine, but the noise is really bad outside.
I noticed that when i make some pressure to the bottom in the contactor the noise disappear, is like that part is not doing a good contact.
24vac,50/60 hz. attached can see pics of parts and a/c specifications.
If somebody can tell me what can I do? and why is this happening.... thanks
Luis
 
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Old 05-05-13, 07:05 PM
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Replace your single pole 30 amp contactor with a 24 volt coil with a new contactor.
Turn off the stat and turn off the breaker or service disconnect for the outdoor unit before replacing it.
 
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Old 05-05-13, 07:20 PM
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thanks Houston204.
just one question, why do I need to change both?the coil and contactor?
luis
 
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Old 05-05-13, 08:01 PM
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The coil and contactor are a set.
Most, if not all, coils are permanently installed in that type of inexpensive contactor.
 
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Old 05-05-13, 08:08 PM
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The coil and contactor are a single piece.
 
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Old 05-05-13, 08:16 PM
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ok, if I understand the coil and contactor is only one part?
so is the one I show in the picture?
 
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Old 05-05-13, 08:24 PM
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Your picture is a contactor and coil assembly. The yellow and black wires on the sides are the connections to the 24 vac coil.


3100-15Q108 is the part number for that contactor. You can take that unit to any HVAC supply to get a replacement. Very common part. There are many different replacements for it.
 
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Old 05-05-13, 08:31 PM
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thank you so much for your help.
 
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