I have a gas furnace that has elec ignition, once that gets real red, burner comes on for about 3-4 minuetes and then turns off? Any Ideas?? Blower at bottom of furnace never blows, but small blower up top comes on before burner lights and after it goes out it stays on for about 4-5 minuetes? Please help it is cold here in Michigan!!

Brand and exact model number of furnace?

Not sure! It has NO name anywhere on it!! It was made 1993 is says, it has red led light that blinks!!

How many blinks?

Post a picture of the furnace!

4 blinks which meant limit switch failure??

Maybee you can call me?? I won't be at that house until Monday (tomorrow) I am in Michigan, where are you??

Sorry no phone calls. I only help out here when I have the time and the phone is a pain. I would look on the wiring diagram on the back of the furnace blower door and trace the wiring to the limit switch. Test switch and replace if defective. The furnace MUST have a limit switch installed. There might be another problem that will shop up during testing and this problem could have caused the limit switch to become defective to start with. If you do not know what you are doing call a pro for ON Site service.

Check wiring,sounds like a goodman furnace,check all limit switches,and if that doesn't work call a pro,but not SEARS

Thanks for help!! What is limit switch?

A limit switch is a safety device designed to not allow the furnace to overheat and cause a possible fire.

Where is it located?? Also- I was just there and the heating element gets real red, and burner won't light but for a 1/2 second then goes out?? Any ideas??
God Bless

Quote:

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Originally Posted by marcwixson

Where is it located??? Also- I was just there and the heating element gets real red, and burner wont light but for a 1/2 second then goes out???? Any ideas????
God Bless

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Did you check the limit switch(they are round with a wire on each side and should have a button on the top.push the button down,you should have 4 limit switches on the furnace 3 should be by the burners and 1 should be by the blower.If that does not work call me 330-239-2644 and I will walk you threw the furnace.

Thank you all so much for your help!! I have given up and have a furnace repair man coming Tuesday!! Again- thanks alot- marc