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My furnace keeps burning wires in the fuse box... right before it does it will kick on and off rapidly.

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  • Kent Guidry
    Kent Guidry May 11, 2010

    Lonewolfslad can you tell me if these wires are near the flames?

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  • 1,420 Answers

Check the Amp draw of the furnace. May turn out to be a bad blower motor.

Posted on Feb 20, 2009

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There is a short in the low voltage wiring somewhere...this type of thing can be very hard to track down and is probably a wire rubbed through somewhere...
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Just moved into this house and notice the furnace not working right It is and older unit know name or writing on it I rehooked up wiring to it but now blower run all the time and the only to shut off is...


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Heat or air wont kick on but indicator lights show all is well...and it clicks likes its supposed to be on?


It sounds like it's a thermostat problem or a power supply problem with the furnace. One way to troubleshoot the thermostat is to take the thermostat off the wall and you will see the wires and terminals there. R(Red) is Power, W(White) is Heat, Y(Yellow) is A/C, G(Green) is fan motor, and B or C (usually a blue wire) is Common and sometimes hooked up, other times not, depending on system. There also can be more wires if you have a heat pump, but you will just need to know the ones above. Take a jumper wire or needle nose pliers and carefully jumper the R terminal to the G terminal and you should have the fan motor kick on, R to W, heat should kick on. By this time, you will know if the thermostat is bad if everything is coming on when you jumper it. Be careful not to touch any other terminals or wires together and don't worry about the current through the thermostat wires, it's just 24v, so nothing major at all. If it's the furnace, you may have flipped a breaker or blew a fuse inside the furnace, depending on what model you have. If it has a circuit board, it should have a troubleshooting light that indicates the problem and can usually be read on the back of the furnace doors. You may also try resetting the breaker to the furnace as this sometimes helps. Hope I got you on the right path and good luck!

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Lennox gas furnace G21Q4/5-100-1 sometimes won't kick on


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Feb 16, 2010 | Heaters

1 Answer

Furnace kicks off and right back on


If this is a newer furnace, an indication of an error is that the room air blower stays on. Get in front of the furnace and see if you can see any blinking lights. Try not to remove any panels as you will erase any error codes. There should ba a small viewing port that you can look through. Once you count the blinks, look at the wiring diagram for the error code chart. It may give you a starting point. Can you tell us a make and model number of the system?

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I've posted a question about replacing the fused disconnect with a set of breakers. I'm a bit confused about which wire goes where. The answers I've gotten have been helpful but I still need a bit more...


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

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3 Answers

3amp fuse keeps burning out


Hi,

when a fuse blows, its telling you that theres a fault. this could be a loose or broken wire.
or alternatively, the fuse rating is too low. you could check the wires are tight. and also possibly try fitting a 5 amp fuse. check first that the fuse is rated correctly for the appliance. usually 3-5 or 13 Amps.

Mike @ compurepair.

Nov 17, 2008 | Goodman GMS90703BXA Heater

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