Carrier A/C unit not staying on


  #1  
Old 05-28-15, 11:06 AM
T
Member
Thread Starter
Join Date: May 2015
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Carrier A/C unit not staying on

Hello,

I have a 4 ton Carrier unit that is over 20 years old. Besides obviously replacing it because of its age, I was wondering why its doing what its doing...

The a/c is blowing through the vents but not very cold. I look at the unit outside and the unit turns on for about 15 seconds and then shut off. It repeats this periodically. I replaced the filter but it did not help. Someone told me the compressor must be burned out since an A/C that old doesn't have low/high pressure sensors.

Also im in NJ. One repairman told me $3800 for Rheem and $4000 for a Carrier (4 ton each). That seems cheap. Should I be concerned?

What are your thoughts on the cause of the problem and solution?
 
  #2  
Old 05-28-15, 11:10 AM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 1,771
Received 0 Upvotes on 0 Posts
Depending on the model # it could have high and low pressure switches.
 
  #3  
Old 05-28-15, 11:28 AM
T
Member
Thread Starter
Join Date: May 2015
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you for your reply. The Model is 38ED048300
 
  #4  
Old 05-28-15, 11:51 AM
C
Member
Join Date: Aug 2008
Location: Texas, California
Posts: 1,407
Upvotes: 0
Received 7 Upvotes on 7 Posts
Should call a AC tech to check the charges first. low charge can cause short cycles.
 
  #5  
Old 05-28-15, 02:03 PM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 1,771
Received 0 Upvotes on 0 Posts
Can't find anything on that unit. Can you post a close up pic of the wiring diagram?
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: