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The contactor inthe outside unit well not pull in.

How can I tell if it is contacter on the outside unit or the circuit board in the furnace? the contactor well not pull in.

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If the contactor will not pull in then the contactor is bad and needs to be replaced. They operate off of a small electrical pulse and they are made mostly of plastic so when then go bad they get stuck very easily and it is a fairly common problem

Posted on May 23, 2009

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We have Lennox Elite Series furnace and central air. Blower would come on but air cond. did not. He replaced circuit board ECG1, I believe. I don't think he was sure if that would repair problem. Our...


Look at the inside of the cover on the furnace and it will tell you what's the code mean.
I think because was calling for Ac that's why you are having that blinking red light.
Turn furnace off on switch and turn it back on and that should clear error code .
To check your air conditioning unit that's the unit that's outside .
Check to see if contactor is pulled in .if it is and nothing is running then check the capicator. The capicator is the oval metal thing that's tuck next to the capicator with 3 wires attached to it .
If it bulky then it's bad .
That is the most common issue with these unit.

Jun 01, 2017 | Heating & Cooling

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I have Carrier 38TKB036 3 ton A/C condensing unit and one 28CCA036 3 ton A-coil to provide A/C to home thru existing furnice. A/C was on and stopped working. Turned off/on, but will not come on. Any...


Is the furnace fan (indoor fan ) running. If not the problem is with the inside unit. It supplies the control power to operate the entire system and has a control fuse on the circuit board. If it is running but not the outside unit then the problem is outside.

Aug 08, 2011 | Carrier 38CKC042 Air Conditioner

1 Answer

Model 363616ba There is no control voltage going to the outside unit. Outside unit will not energize. What is the routing for control voltage? Do you have a schematic with details of the control...


The control voltage comes straight from the furnace or thermostat. Its 2 to 5 wires depending on if you have a heat pump or conventional system. If you have a control board on the inside of the furnace that has the terminal (y), then your control voltage will come from that terminal and the common terminal. Sometimes they have it connected to the (y) terminal from the thermostat, but will usually still be hooked up inside or right by the furnace. In (COOL) mode, the thermostat energizes the y and g terminals, (cooling and fan), which is sent to the outside unit on the contactor. You need 24v going to the contactor outside for it to pull in and make contact. If you have lost the low voltage, then it usually means bad transformer on the furnace (which nothing would work), faulty control board on furnace, faulty thermostat, or your low voltage wires could of been cut, chewed through, etc. If you do have the low voltage by chance, then it could be a faulty contactor on the condensing unit. I'm just throwing some things out there, its kind of difficult without knowing all the equipment you have. Have anymore questions, just ask. Good luck!

Jun 12, 2011 | Goodman Heating & Cooling

1 Answer

Randy2465@yahoo.comwhen you turn setting on thermostat to cool the thermostat clicks but outside unit and the inside fan neither come on?


Sounds like you might have a low voltage short possibly at contactor at outside unit (Condenser).
What happens is if your contactor has a short it will pop a 3 or 5 amp fuse at the furnace circuit board. This fuse will continue to pop until the short is fixed the best way I have found is to take off all low voltage wiring at furnace circuit board put them back one by one first with R then W then G then Y if it pops at Y your contactor has to be replaced.

May 11, 2011 | Goodman Heating & Cooling

1 Answer

Outside unit won;t come on blower on furnace inside works central air unit is 5 yrs old


First check the disconnect/circuit breaker for the outside unit. Then set the thermostat to make the unit come on. Remove the cover on the outside unit where the power goes in so that you can see the contactor. Is the contactor pulled in? If it is, check for proper voltage on the load side of the contactor. If thats good then look at the capacitor. If it looks swollen then it is bad otherwise you can check it with a multimeter or have a heating and air supply check it for you. If the contactor isn't pulled in, remove the face of the thermostat and install a jumper between the R and Y terminals. If the contactor pulls in then, the thermostat is bad. Let me know what you find so I can give you more advice if this doesn't get you going.

Sep 12, 2010 | Goodman Heating & Cooling

1 Answer

Outside will not come on


First check the circuit breaker or fuses. Remove the cover on the outside unit that covers the contactor, circuit board, and capacitor. Check for voltage on the line side of the contactor. Set the thermostat to make the air come on then check the contactor to see if it is pulled in (contacts closed). If it isn't pulled in then check for 24 vac on the contactor coil. If the contactor is pulled in check for voltage on the load side of the contactor. If you have it there then check the capacitor(s). Some units have 1 that runs the fan and compressor and some units have 2 ( 1 for the fan and 1 for the compressor). If you don't have 24vac at the contactor you can install a jumper at the thermostat between R and G if it is just an air conditioner or R and Y if it is a heat pump and see if the thermostat is bad.

Aug 13, 2010 | Goodman CKL42AR42 Air Conditioner

1 Answer

Air conditioner compressor will not shut off.


Remove the cover on the outside unit that covers the circuit board and contactor and capacitor. Then start the unit and set the thermostat so that the unit cuts off. Then go back to the outside unit and see if the contactor is still pulled in and the unit is running. Next open the breaker and see if the contactor drops out. If it doesn't your contactor could be stuck. Try to free it or replace it. If not the problem could be in the circuit board.

May 26, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Outside unit runs continuously, even when system is off.


On A/C units, there is a low voltage line that leads to a contactor, which engages to close the high voltage circuit to the condensor unit. Over time, the accual contacts in the contactor can weld themselves together. Try shutting off your furnace breaker but leaving on the one for the outside condensor unit. If it still runs, your contactor probably needs replaced. Contact a licensed electrician or HVAC contractor and tell them you think your contactor is in need of replacement. Is a fairly simple and quick replace, but the contactor itself is not cheap.

Oct 10, 2009 | Ruud Central System Air Conditioner

1 Answer

Contactor will not pull in


Check the cotactor coil for 24V. Leads on the side.

May 23, 2009 | Weather King 10AJA6001AH Air Conditioner

1 Answer

The contactor well not pull in.


Also if it where the circuit board that had gone bad. Your furnace would not turn on at all not even the blower motor. You can test them both by looking for 24 volts to the board, and 120 volts per leg of the contactor

May 23, 2009 | Weather King 10AJA3001AH Air Conditioner

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