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Thanks Labman, I figured out the flame, and I am working on the wiring.

Need help!
The pilot light disappeard, and I tried to re-iginite by match, by lighter, but all fail. I need emergency help from you, please! :o

I tested relay by using multi-meter, and it sounds good. Now I am concerning about the wiring. Right out of the blower motor, there is a small box that contains a transfromer and a relay. On the box...

Do you think it might be a problem of wiring on the limit switch? Someone repaired wires to A/C before summer came this year.

Yes, you are right. My furnace was older, around year 1985. But I found 5 wires connecting to the relay instead of 4, of which 2 were connected to the limit switch. Do you know the 5 wires are right?...

Thank you, I know where it is, and will work on it.

Thank you very much, Labman. The interesting thing is fan worked perfectly in the summer time when I uesed A/C. At your point, there are 2 control systems to the fan for heater and cooler separately?...

[QUOTE=labman]You have 2 temperature limit switches in the furnace. One turns on the blower once it is hot enough when the furnace comes on. The second one turns off the gas if the blower fails to...

I have a problem with my furnace blower not starting automatically. It works good when I swiched the fan option to "ON", the furnace was burning and fan was running. However if I pick "AUTO", only...