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  • A/C slow to respond to thermostat

    When I turn thermostat to A/C, (temp difference +3 or more degrees) unit thinks about starting from a few seconds to about 30 seconds. There has always been a few seconds to respond.
    My question is what is causing the 30 second delays? Compressor kicks in shortly after fan as normal.

    Any thoughts?
    2012 Montana 3700rl
    2016 Ram Larimie crew 3500 Aisin

  • #2
    Rick says first thought isn't good. 2nd thought - better think this through some more. My thought- I predict your Montana will soon be visiting our barn.
    Linda Say
    Van Wert, Ohio

    2013 Montana 3800RE
    2015 Dodge Ram Dually Diesel

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    • #3
      I think some units have a built in delay

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      • #4
        We have always had to wait. I thought that was normal operation. It works just fine once it is up to speed.
        Vicki Allen
        Byers, Colorado
        2010 Montana 3150
        2017 Ford Super Duty F350 4X4 6.7 Diesel

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        • #5
          When first turning on your A/C there will be a delay. The reason is for an overload protection built in. Lets say your A/C was running and suddenly you lost your electric power and within say 10 seconds your electric power is restored. If your A/C were to suddenly come back on without a delay in the start up, the high pressures from within the system being shut off and quickly turning back on would more than likely trip a breaker.

          That's why you have a delay.

          Now the other reason for a delay is when you first ask for A/C, again the system is protecting it's shelf. First the fan kicks in, then a few seconds later the A/C compressor kicks in. This is by design as so as to not draw the full load of the fan and compressor kicking in at the same time causing a high current condition.

          When the A/C unit is getting ready to shut down the reverse happens. The compressors firsts turns off leaving the fans run for about 15 seconds or more to help remove some condensation from the system to help prevent mold build up which causes odors.

          Hope that helps.
          Scott Luciano
          Lakeland, Florida



          2012 - Ram 3500 4x4 Longhorn Dually, 4:10 Max Tow PKG, Sun Roof, 440 HP 925 TQ, H&S Maxx Street Programmer

          2014 - Montana 3402RL, Paramount & Full Time Living PKG, Goodyear G614 Tires, Amish Made Furniture

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          • #6
            Originally posted by Montana Rover View Post
            When first turning on your A/C there will be a delay. The reason is for an overload protection built in. Lets say your A/C was running and suddenly you lost your electric power and within say 10 seconds your electric power is restored. If your A/C were to suddenly come back on without a delay in the start up, the high pressures from within the system being shut off and quickly turning back on would more than likely trip a breaker.

            That's why you have a delay.

            Now the other reason for a delay is when you first ask for A/C, again the system is protecting it's shelf. First the fan kicks in, then a few seconds later the A/C compressor kicks in. This is by design as so as to not draw the full load of the fan and compressor kicking in at the same time causing a high current condition.

            When the A/C unit is getting ready to shut down the reverse happens. The compressors firsts turns off leaving the fans run for about 15 seconds or more to help remove some condensation from the system to help prevent mold build up which causes odors.

            Hope that helps.
            I KNEW there was an explanation..... and Mark had told me it was the way it was supposed to work..... but he was in bed when I first saw this last night! Thanks for the good explanation Scott!
            Vicki Allen
            Byers, Colorado
            2010 Montana 3150
            2017 Ford Super Duty F350 4X4 6.7 Diesel

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            • #7
              Good job scott
              Rick Say
              2013 3800re
              2015 dodge 3500 dually

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              • #8
                I understand the delay that's built into the A/C start up, however; I'm searching for what can cause the difference in start up timing. 3-4 seconds from the thermostat calling for cooling and the fan start up was normal for my unit. Now there are times when 30 seconds goes by. Seems like I have something in the system that has weakened.
                2012 Montana 3700rl
                2016 Ram Larimie crew 3500 Aisin

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                • #9
                  Mine always waits 3-5 seconds after I turn it on for the first time and the fan comes on, then more delay for the compressor to come on. And then there's the power fail delay. Same thing happens at home with my Carrier system.
                  Jim Abernathy
                  Holly Springs, NC
                  2014 Ram 3500 LaramieĀ® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
                  2014 Montana 3402RL, Level UP, G614's, TST 507, Voyger Wireless Backup camera

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                  • #10
                    Glad Royce asked the question and thanks Scott for the answer. I wondered the same thing.
                    Don Lee
                    Full timing with a Madison, SD domicile.

                    2012 Ford F350 Lariat - DRW 6.7L Diesel
                    2016 Montana Legacy 3710RL with 8 - 150w solar panels, charging three lithium ion smart batteries, 2800w inverter.

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