Central A/C not blowing cold


  #1  
Old 05-12-23, 05:36 PM
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Central A/C not blowing cold

I had a 30 year old system replaced in 2021... Installers provided free maintenance less than a year ago, but now it's not working.

Things I have checked:
- all components seem to have power
- condenser is clean
- compressor sounds like it's running
- condenser fan is running
- air filter (in natural gas furnace) replaced
- blower fan is running
- can hear coolant lines hissing

I removed a port in the air handler to peek at evaporator coils. While the angle makes it hard to see, the bottom few inches (roughly one fifth) of the coils appear lightly frosted, whereas the upper parts look bare and coppery.

Currently I have the blower running to help thaw it in case it's frozen up. It's still under warranty but they will charge a truck fee, not sure about the service.

Is there anything else I can easily diagnose here?

 

Last edited by bunnsion; 05-12-23 at 05:44 PM. Reason: add images
  #2  
Old 05-12-23, 05:43 PM
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Sounds like itís developed a refrigerant leak and is low on charge.
 
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Old 05-12-23, 06:24 PM
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That was also my suspicion. I recall reading somewhere that this is fairly common with new installations... If that's the problem, how does it get traced and fixed?
 
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Old 05-12-23, 07:31 PM
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Call the installer back. Search for leaks or fix the leak is not a DIY job.
 
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Old 05-12-23, 07:35 PM
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The unit should have been tested with nitrogen when installed to verify there were no leaks. And a micron gauge should have been used to verify the system was tight during evacuation.
The leak can be found with an electronic leak detector.
DO NOT let them put any leak seal substance into the system.
 
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Old 05-12-23, 08:10 PM
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So, request that they discuss before they take any action to repair.

They are a large local company, what are the chances they would try to fix this with a spray-in sealant?
 
  #7  
Old 05-12-23, 10:19 PM
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Donít know.
Thatís if itís even low on charge.
 
  #8  
Old 05-13-23, 12:30 PM
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If they are a class company there shouldn't be any charges.
A system under two years old should NOT require any refrigerant.
It's apparently a slow leak and more than likely an installation issue.

I would feel disgraced if that was my install. I'd want to make it right.
I'm not a fan of sealants but they should only be used in an older system.
 
 

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