Ask Experts Questions for FREE Help !
Ask
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #1

    May 18, 2010, 10:54 AM
    I have a home a/c unit turns on and off
    Hello,
    My A/C unit keeps turning on and off. When we turn on the A/C it will run for a min. or two and then kick off and then come back on. It keeps doing it over and over. I replaced the thermostat and the wire going to the outside unit. Is it a low voltage problem?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #2

    May 18, 2010, 12:58 PM

    Does the fan inside also go on and off or just the outdoor unit?
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #3

    May 18, 2010, 01:16 PM

    Hello Josh,
    The fan inside stays on. It's the unit outside that will run for about a min. or two and then shuts down clicks two or three times and starts to run again. I have replaced the contactor outside also.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #4

    May 18, 2010, 03:09 PM

    Ok so it is just a outdoor problem, next question is the fan and compressor both kicking in and out? Or is it one or the other? Sounds like it may be a low pressure switch. Freon pressure is higher while the unit is not running, when it kicks on the pressure will drop causing the switch to kick out. After it kicks out the pressure will again rise causing the unit to come back on. Then off and so forth
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #5

    May 18, 2010, 03:20 PM

    Hay Josh,

    The contact clicks on and off. I had a metter on it while it was going on and off and it was still reading 24 to 25 volts.
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #6

    May 18, 2010, 03:21 PM

    It is a Carrier 3 ton unit
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #7

    May 18, 2010, 04:08 PM

    If it still has the 24 volts then I am about 95% sure it is a low pressure switch problem.
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #8

    May 18, 2010, 04:12 PM

    Where is the low pressure switch? What dose it look like?
    emaxxdr's Avatar
    emaxxdr Posts: 6, Reputation: 1
    New Member
    		  
    #9

    May 18, 2010, 04:14 PM

    Dose it have wires connected to it or is it welded to the freon line?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #10

    May 18, 2010, 05:35 PM
    Quote Originally Posted by emaxxdr View Post
    Dose it have wires conected to it or is it welded to the freon line?
    Both, it is inside the ac unit, may have 2 of them one on little line for high pressure, one on big line for low pressure. Odds are you are probably low on freon, the odds of having a bad switch are not very good. But I have seen bad switchs before.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

AC Unit turns off for no reason I can figure out [ 11 Answers ]

My outside AC unit has started doing something I just cannot figure out. It will run for some time and then cut off. You can hear it when it does so, kind of a hum. Fan not turning, but can hear the unit. If I leave it off for maybe 10 minutes or so I can turn it back on at the thermostat. It...

Live in a mobile home with intertherm heat and air unit the unit outside unit has bee [ 1 Answers ]

Live in mobile home with an intertherm unit outside unit is no longer running didn't know if it even needs to be running with the heat

Outside unit turns on. Rotates, inside unit turns on. Does not blow / suck. [ 4 Answers ]

Ok, we had a storm today, and I got home from work to find the house at a hot 75 degrees... the outside unit wouldn't turn on or work or anything... So, I went out and turned off ALL of the breakers, and then turned ALL of them back on... OK, the outside unit spins now... Then I went into...

Outside unit doesn't come on when thermostat turns inside unit on so no heat? [ 1 Answers ]

My thermostat will trip my heater to turn on. The inside blower turns on but the outside unit doesn't turn on. I can get it to go by turnign off the unit at the thermostat and waiting a minute. I turn it on and off until I hear the outside unit turn on. The problem is when the Thermostat turns if...

View more questions Search