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Need to totally re-wire my air handler.wire harness melted.found that the blwer motor is bad,cap.blown,and transformer.i need to now how to delete the bunt out harness.the unit is a coleman evcon down flow

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  • pdsheets2002 Jun 06, 2010

    i have a coleman evcon air handler.the blower motor went out.i replaced it,and the compaciter and transformer.the over all problem with the unit is that the wire harness melted and is useless.what i need to know is how to re-wire the system around the melted harness.the new moter i bought burned out after replacing it.


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Using the model number and serial number for the furnace, you should be able to order a new wire harness for the the air handler. Most wire harnesses are comprised of the wires themselves with a polarized molex connector at either side that plug into the various locations within the air handler.

Couple that with the original wiring diagram with the unit and you should be able to do the wiring yourself. But without a model and serial number of the unit, you may be a little in over your head.

Remember that the key is not to just rewire the furnace and install a new motor but rather to find the root cause to the failure. I would suggest checking the sequencer or fan relay. A stuck relay or failed relay may have allowed the blower to run without the proper voltage and caused the failure in the first place.
Simply replacing parts without test the whole unit may yield another short term fix and quick failure.

Posted on Jun 06, 2010

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Please rewrite your problem more clear and understandable. I will solve your problem.

Posted on Jun 05, 2010

    FIKRET UNALIR Jun 06, 2010

    You can do it by using drill. Plug the inner part of motor to drill and use zimbabve to clean and correct it. Replace the parts which melted. Collect together the motor and control it. If you have any additional question I am waiting to answer it.


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1 Answer

Goodman air handler ARUF036-00A-1A does not blow air in heating or cooling mode only hums/buzzes, what could it be?

Looking at the wall thermostat, you will see the fan switch that has two settings: fan auto, fan on.
You will need to place the fan switch in the fan on position for testing purposes.
This will make the indoor fan run continuosly, and never cycle off.
In the fan auto position, the fan will turn off when the thermostat temperature setting has been satisfied.
Remove the air handler access panel.
Is the air handler fan operating?
If the fan isn't working see if you can listen closely if it is humming, or can touch the motor to see if it is hot.
If it is humming and has a bad capacitor, you can tell this without having an electrical tester by spinning the fan wheel by hand.
Be very careful... making sure your hand won't get cut by the fan wheel spinning when it starts up.
If the fan spins and picks up full speed, replace the defective fan capacitor.
It is the shiny silver metallic cylindrical object with electrical wires attached to it.
Make sure you write down where those wires attach and turn the power off before removal as they carry 240 volts to the fan motor.
If you find that the fan wheel doesn't turn freely when you try to spin it by hand, the bearings have seized and you will need to find another fan motor of the same size, shaft length , speed , and horsepower to replace the defective motor.
Keep in mind that a humming sound in the air handler COULD be from the transformer instead of the fan motor.
The transformer is a black cube shaped device with electrical wires attached to it.
If the 24 volt transformer goes bad, your thermostat will not function and nothing will come on.

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Check for power to the air handler.
If you have power there,check power on the low voltage side of the transformer in the air handler.
No low voltage out of the transformer is will need replacing.
There may also be a 3 to 5 amp fuse on the air handler control board that is blown.
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Usually that is because of a blown fuse in the air handler or fuenace which ever you have or the transformer that supplies the 24v to the thermostat, also in the air handler or furnace, has gone bad...
Check to see if you have 24v at the transformer and then flow it from there...


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maybe a blown fuse if it has one... if not then you blew the transformer...
Check on the circuit board in the furnace or air handler for a fuse...
if there isn't one... then you will need to replace the 24v transformer... they blow very easily...


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Either you have blown the low voltage fuse located inside the air handler (if there is one) or you have blown the transformer feeding the low voltage control wiring.

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I changed the thermostat and then the ac stopped working

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Remove thermostat wires writing down where each one goes. Make a jumper wire and install it between r and y or r and y1.Put everything back together and turn on power. IF blower motor and ac start, you have
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If nothing happens then you either have no power to furnace, transformer
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It's a 24v transformer. Your indoor unit houses the transformer for the outdoor unit. The outdoor has a low voltage (24v) supply running to it to push in the contactor for the outdoor unit to run. If your air handler inside has no power then it will kill your LOW VOLTAGE power to the outdoor unit. You will still have the high voltage power to the outdoor unit. You may have a fuse on the switch for your air handler blown if there is one. On the disconnect switch mounted to your air handler, you will have a door to open and a fuse in there. If not, check your main breaker at the panel. If you don't know what a transformer looks like, you may want to have someone familiar with electrical of HVAC help you. To check the transformer for power, you first need power to your air handler, which you don't have. I would say that is not your problem. I would assume your air conditioner is not running outside, correct? Your problem is the power (HIGH VOLTAGE) to your air handler. Loose wires, blown fuse, tripped breaker etc...

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Stopped up drain line caused float switch to trip. Blow out drain line. Blown fuse in Air Handler. Bad transformer. You have a 3 ton on a four ton air handler. You need to lower fan speed to low dor better effeciency. Could have bad Tstat butchances are control voltage problem.

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