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Condensing unit continues to run after air handler is stopped. Problem is intermittent. Thermostat replaced. Suspect air handler relay. which one?

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When this happens, most often you'll have a stuck contactor coil on the condenser. If you buy it , it should cost $20---to 15.00 and you can add if you turn off the power (240volts) and the furnace power!

Posted on Sep 09, 2008

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A/c won't stop running and no cool air


There seems to be a problem with the wiring of the thermostat. Apparently the thermostat is calling for cool (if wired properly), but is not being satisfied. The thermostat is just a switch. When there's a call for cool, the thermostat sends 24-28 volts to the contactor (inside the condensing unit to start the compressor and outdoor fan). The indoor fan is energized through the fan relay (inside the air handler). When the temperature in the conditioned space reaches the set temperature,then the thermostat cuts the power to the contactor and it stops the compressor and outdoor fan. Check that the compressor is actually running, if not, check for 24-28 volts on the wires feeding the contactor, if there is, and the contactor isn't closing then the contactor is defective. If the contactor closes and the compressor doesn't come on, check the capacitor. If the capacitor is good then check your compressor motor. I suspect you have an improperly wired thermostat

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1 Answer

Air handler fan cuts on runs a few minutes and then cuts although thermostat is set to off.


your thermostat could be wired in to a energy recovery venilator which will bring the unit on for a certain amount of time every hour some thermostats have recirculate mode which will do the same thing to help filter the air

Apr 16, 2013 | Goodman Heating & Cooling

2 Answers

My A/C freezing its coils, while the fans keep running. The AC unit (outside) keep running and never stop caused the coils freezing. It doesn't matter when I turn off or set it to Cool position, the...


Sounds like the contactor in the condensing unit is stuck. That is why it will not turn off when the thermostat is satisfied. If the inside air handler is not blowing and the outside condensing unit is running, then this will cause the inside coils to freeze up rather quickly.
The contactor is located in the outside condensing uni in the electrical compartment.
If it is sticking it will need to be replaced.

Sep 07, 2011 | Heating & Cooling

1 Answer

How to wire condenser and air handler to the t-stat


Assuming this is a standard unit the thermostat connections you will use: Y, R, G, W and possibly C.

Run two conductor thermostat wire to the condenser. The condenser will have two wires to connect. Connect the two conductors to the condenser wires and run them in to the air handler.

At the air handler, connect the two condenser wires to: Y (yellow) and C

Run 4 or 5 conductor thermostat wire from the air handler to the thermostat. At the thermostat, connect the yellow wire to Y, the white wire to W, the green wire to g, and the red wire to r.

At the air handler, connect the thermostat wires: White to w1, yellow to Y, green to G, and red to R

*Y will now be connected to the thermostat and the condenser
*If you have 5 conductor wire to the thermostat, connect the last wire (which is probably blue) to C
At the air handler, connect the last wire (blue) to C. This will enable you to have 24 volts at the thermostat in case the thermostat actually requires 24 volts to operate it.

R=hot
G=fan
Y=cool
W=heat

May 19, 2011 | Heating & Cooling

1 Answer

My air conditioner won't stop running. The fan won't stop on the upstairs unit unless we remove the thermostat from the wall. The condenser runs constantly. It does cool when the thermostat is plugged...


Does the compressor also run constantly? If it does, the problem with the outside unit may be a stuck contactor. You can remove the cover where the power goes into the outside unit and the contactor should be located near there. If it is stuck, turn off the power to the outside unit and tap the contactor to try to free it, depending on how bad the contacts look, or replace the contactor. As for the indoor fan, you could have a bad fan relay, if that is what your unit has, or a bad fan sequencer, which is what some units use. These components will be located in the air handler. Hope this helps. Let me know what you find if this doesn't help and I can offer more advice based on that.

Sep 08, 2010 | Heating & Cooling

1 Answer

Why does my fan runs continus. and the condenser won't run out side.


The fan runs continously because your condensor is not kicking on and removing the heat. The thermostat needs to come under the set temp. to kick off the fan. If your compressor doesn't run and the fan on the outside unit does run, your compressor has an issue. If nothing runs outside, then your transformer on the inside unit(air handler) has an issue. This could also be a control relay on the condenser or the air handler.

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1 Answer

4 ton rheem 3yrs old thermostat


It is possible that the relay in the thermostat for "cooling" has gone bad. The relay that runs the blower is different than the condenser relay. Check that you have 24v AC coming from the t-stat to the "y" terminal at the air handler. That same "y" wire should go out to the condenser, make sure then that you have 24v out there. If you have 24v at the condenser then see if the contactor is pulling in. If not then you may have a loss of charge switch that is stopping the current to the contactor. See if you have 24v to the coil of the contactor. If the contactor is pulling in and power is going to the compressor then the compressor has failed. If this is the case the condenser fan will be running but the compressor is not. If neither the condenser fan or the compressor is running then you have a problem in the 24v circuit, which could be a bad wire or a safety switch.

As you can see there are a number of possibilities for your problem. You will need to methodically go through everything to eliminate the possiblities till you isolate the problem,

I hope that this will help you to solve your problem and get you cooling again!

Thanks for using Fixya!

Heatman101

Nov 23, 2009 | Air Purifiers

1 Answer

Trane air handler cycling rapidly


Depending on the age of your Trane unit. The fan relay has a time delay. This is a solid state board on the relay. Most of the time they stick on or off. Check for loose wires. But start with relay.

Jun 03, 2009 | Heating & Cooling

1 Answer

Carrier A/C Intermittent Shut-down Problem


It sounds like there is something in the system that is over heating. A t-stat will either work or it won't there are relays that have 24v coils and can become weak. If your air handler is shutting down it shut down the condenser, if the air handler is staying on but condenser is shuting down check the outside contactor. I am an a/c contractor and can be contacted at 504-722-3946 Eddie.

Sep 29, 2008 | Carrier 38BRC048 Air Conditioner

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