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A/C delays coming on when adjusting thermostat

Must adjust thermostat up and down several times to get A/C to come on.

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"Don't worry about this,, this feature was added tothe outside unit to prevent short cycling, like you're doing now.Mr.Rocket Scientist!.

Posted on Aug 21, 2008

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When thermostat turned up furnace ignites, heats and fan starts when plenum is up to temp. When thermostat is turned down flame goes off but fan continues to run.


If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


The second possibility, if the blower never shuts off at all is that the relay itself could be stuck in the closed position and keeping the fan on.

Sep 30, 2015 | Air Conditioners

1 Answer

What i mean is the a/c turn on for about 3 minutes and then off for 2 minutes and on again it keep continue like that.


1st it sounds like you have an old Mercury or bimetallic thermostat. If that is the case you need to change it. It sounds like it is bad. Most all new digital stats have a time delay built in that in most cases is adjustable. This allows the unit time to bleed down the head pressure so it does not start under a load causing it to overheat.

Feb 24, 2015 | Air Conditioners

1 Answer

Time delay relay?


it does have time delay but only for loss of power or if someone plays with thermostat making it go off and on. some time delays have a dial to change length of delay. it would be placed in 24 volt circuit to make or break circuit to contactor.

Sep 15, 2013 | Intertherm P3RA-042K Air Conditioner

1 Answer

Magnetic switch on outside unit does not activate - when I depress and hold in relay fan and compressor operate and cool house


Hi, this relay is your contactor that you are pushing in to make it run. You are not getting 24 volts to the 2 small wires that terminate on the side of this contactor. These 2 wires are low voltage and are controlled from the thermostat and indoor unit. You either have a faulty thermostat, or you may have blown the fuse on the indoor unit, if yours has one. Remove the panel on the indoor unit to see if you have a circuit board.See if you have a fuse that is just like a automotive plug in fuse that's plugged into the board. See if it is blown. If not, is the indoor unit running, its just the outdoor unit that will not come on? If the indoor unit comes on and runs, but the outdoor unit does not come on, you more then likely have a time delay relay that is mounted on the outdoor unit that is faulty and will not send 24 volts to the delay.It has failed, and that is why it will only start when you push the contacts down on the contactor. Some are a small black square box with 2 to 3 wires on them, and some are a small square circuit board that will have T-1, T-2, and the box type will have like a timer on the face. They can be bypassed, as I have done this many times to get people cooling, but you need to no what wires to remove and terminate to the contactor coil. The large wires going into this contactor you are pushing down, are very high voltage, so I wouldn't recommend doing this, as you will get shocked and this is not solving your problem, but I am glad you have told me what is going on, it has helped very much. If your indoor unit comes on with the thermostat, I am sure the stat is good, but your delay relay has failed not letting the contactor to energize by its self. You would need to find out which 2 wires on this delay relay to move to the contator coil. You would need a meter to check to see which ones to use. You can do this. Turn off the breaker to the complete unit, both indoor and outdoor. The 2- small wires that are coming from inside your house that run along the copper pipes are the 2 you need to use. If you do have a time delay relay, these 2 wires will go into the control area, and wire up to 2 other wires that plug into this relay. What you can do, is take these 2 wires coming from the house, probably red and white, and what you need to do is the contactor that you have been pushing down will have a brown and blue small wires hooked on each lower side of it. This is the 24 volt coil. The 2 wires have 2 female connectors on the ends of them.Leave them plugged into the coil if you have enough to work with, and cut one at a time and take the 2 from the house and hook one to one side and one to the other side, tape them up, and you are done!so, all you are really doing is taking the 2 wires coming outside that start the unit, bypassing the bad time delay and hooking them up right to each side of the contactor coil you are pushing down. Very simple, just take your time, and follow my steps. Let me know how you have done. This will save you lots of $$$$. Now, you are activating the coil like it should be, with out the bad time delay, as you will not need it because your thermostat also has a delay. Please let me know the out come.
Shastalaker7
A/C, & Heating Contractor.

Jun 10, 2011 | Air Conditioners

2 Answers

We have a Goodman CKL 3.5 ton 10 seer AC unit. it is labeled Amana Distinction. it is installed in 2006. CKL 42-1L. The problem is that when the wall thermo control kicks on, the fan blows 3 minute of...


Yes there is a way. First You need to see if the outdoor unit has a time delay on it.It would be connected to the contactor and the low voltage wires. If there is not one then there is a problem with your thermostat. If you have the thermostat manual, check to see if there is way to change from the 3 minutes to none. I hope this helps you.

Jun 05, 2011 | Goodman CKL24AR24 Air Conditioner

1 Answer

The heat come on turn off but fan will not shout off.


if you have a gas or oil furnace then the limit control is probably bad. If you have electric heat or a heat pump then the sequencer is probably bad. But first make sure the thermostat is not set to "FAN". The thermostat must be set to "AUTO". Many systems have a time delay on the fan to capture the remaining heat after it completes a heating cycle. Usually several minutes.

Feb 17, 2011 | Air Conditioners

1 Answer

How do you adjust a digital thermstat to match a


You will have to buy either anew thermostat or a digital thermometer. I have been down this road many of times. You might try to make sure the back of the thermostat is insulated and not picking up a additional heat source.

Jun 14, 2010 | Air Conditioners

1 Answer

Duo Therm Thermostat anticipator adjustment


replace your thermostat with a cheap digital heat/cool thermostat - no more problem. (be sure to turn off the power to all parts of the HVAC system before changing the thermostat.)

May 28, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a york hvac system that is 5 years old. I have the thermostat set at 74 and when it turns on only the fan runs circulating the existing air in the house about 20 percent of the time. The a\c works...


It sounds to me like you have a delay on start timer on the compressor that possibly is starting to fail or someone may have adjusted the time band up on it. I myself would remove it and install a delay on break timer and a 5 minute setting would be ample time.

Hope this helps Ya

Jul 13, 2008 | Air Conditioners

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