Nordyne FEH017HA-04 furnace wiring

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Service manual and wiring

3500 Coleman Wire Diagram / Parts manual/ Helpful user ...

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3500 Coleman Wire Diagram / Parts manual/ Helpful user guide (Download) 3400-811, 3400-812, 3400-816, 3400-818, 3400-820, 3400-823 3500 Coleman Wire Diagram ...
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  3500-812 Coleman Electric Furnace Parts - HVACpartstore

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  The 3500 and 3500A series electric furnaces are mostly identical. ... 3500 Coleman Wire Diagram / Parts manual/ Helpful user guide (Download).
  
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Maybe the fuse box is bad , corrosion inside . Take the box apart if you can an look inside . check all the connections for corrosion also.

You need to figure out what caused the melting. A short perhaps? Fix the electrical issue, then replace the melted parts. Melting parts should be a warning that too much current was flowing through said part, or there was high resistance (at a mechanical connection) due to corrosion or poor electrical connections. You were lucky a fire didn't start. Your ECM may be fried, sorry to say. Lastly, always use the correct rating fuse.

trip main breaker in breaker panel, open up furnace and open small door at bottom to access electrical wiring. most of the time on older furnaces , fuse is in series with low voltage red wire..

That is probably normal if it is electric heat to slow the air over the heating elements. Even some gas units do this. Check to see if the unit blower motor has wires for multiple speeds.

this is normal operation for the fan in heat mode.

Multiple speed fans are always wired to run on "HI" for A/C and a lower speed for heat. If there are more than 3 wires on the fan motor, its probably a multiple speed.

call a service person

Hi, I can try and explain this to you without any info? It is fairly easy to do. If you have a box that has a total of 2 fuses side by side then you have a 220 volt service box.If you do have a meter, you can check across the 2 fused wires, switch on, to see if it is 220volts or more.What you need to do is to replace the fuse type box, lets say the box is a 30amp, or 60 amp box, with a box set up with 1- double pole breaker of the same amperage. Take the box to Home Depot and they will show you what box you need.You can do this very easy, step by step. A 2-pole breaker box will have a double breaker inside of it. It will have a silver lug to terminate the neutral wire. The 2 hot wires, take one at a time and one will go into the screw on one side top of the breaker and the other into the other side. This is called the line side, power in.Now, the wires from the furnace will terminate the exact way, one hot to the bottom of breaker and the other Hot to the other side of the breaker, which is the load side, or furnace side. The neutral to the silver lug, and if you have a bare copper wire, it will go to the box if no lug or terminal strip for ground, you can screw it right to the box.It sounds difficult but is very easy. I know you can do this. Be sure you change the fused box with a breaker box, very inexpensive. Just picture the 2 fuses side by side, and the 2 hots will be the 2 that terminate at where the 2 fuses terminated, line side, load side to furnace. You only have maybe 4 wires, 2 insulated hot wires, 1 insulated neutral, and may have a bare ground. That's it for a 220v, 240, v, 208/277volt.Hang in there you can do this. Feel free to send me a link to see this, if they allow it, I am not sure of this. Let me know please and I can have you up and running in no time, Sincerely,
Shastalaker7

the corroded surface is causing arcing wich is inturn heating up the whole works,REPLACE WITH PROPER BREAKER AND BOX AS THIS IS A FIRE HAZARD!