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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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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

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Replaced capacitor on fan in air handler now condenser will not run and fan on air handler will not shut off


fan relay stuck in & control fuse might be blown. see if you have 24 volts at outside unit.

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The fact is, the air handler supplies the voltage, blower, and electric heat. In order for the heat pump to work correctly, the wiring from the thermostat and heat pump need to be hooked up right to the air handler. The thermostat is what tells which component to come on. If the fan stops, but the condenser keeps going, you either have a faulty fan relay on the air handler, faulty thermostat or wiring, faulty wiring at the heat pump, or the contacts on the new unit are sticking, which is highly doubtful considering it is working now. I hope I have helped you understand this a little more. Good luck and don't let them push you around, get someone that knows what they are looking at.

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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.

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1 Answer

Hello, we had central air conditioner installed last October. We turned our unit on for the first time and the outside unit shuts down but the air handler continues to blow air and never shuts down. ...


Hello, if the blower motor runs continuously and does not shut off at tne thermostat then the relay on tne integrated control board is bad. Only option is to replace the control board

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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

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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.

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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.

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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.

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