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As I mentioned before, I had a similar issue as the blower doesn't kick on in "Auto" and I had to run the blower at "Fan On" mode. I had a burnt out relay on the control board which powers up the low...

Please note, most of the furnaces run at two speeds. In the summer it runs at high speed in "Cool" mode and in the winter it runs at low speed in (Heat) mode. You will not feel high velocity in the...

First check the blower runs without any friction. Look for any squeeky noise. Your blower might need to be lubed. Some of them are maintenance free.

Because of your furnace is continuously running...

Hi Labman,

I read your comments. The cost wasn't that bad at all. I paid only $138 for the board. But, the service technician wanted to charge around $560 for replacing the board. He didn't sound...

Hi Labman,

I do have a happy ending story. Yes, I was able to replace the control board with a new one and it's working like brand new. When I removed the old one, I was able to see one of the...

:) Dear labman,

I believe, I have done some home work after everyone's advice.

I found the Heat Tab on the control board. When the thermostat on "Auto", after the burner came on, I checked the...

Hi Labman,

I strongly believe that with yours and others, I will be able to fix the problem. I am lucky in one way that I am able to use the furnace in "Fan On" mode. My wife has already started...

Hi Labman,

I found the limit switch just above the heat exchangers. There are two thermocouples connected with a one cent coin size tab inserted inside and the they are connecte through two blue...

I believe I see only one limit switch, which is located inside the furnace and above the heat exchanger. There are two thermocouples attached with a one cent size round tab connected and placed...

Hi Michella, :confused:

Thanks for the response.

How do I find out whether the limit switch is a part of the control board or outside of the board?

Please help me out.

Thanks, Ravi

Hi "hwuaijuc",

Were you able to fix your furnace? As I mentioned earlier, I have the similar problem as you had.

Labman is helping me out with his comments. I am trying to follow him. In the...

Hi labman,

Thanks for your immediate response. Don't you suspect the flame sensor or the thermostat to be bad?

Please advise me.

Thanks, Ravi :confused:

Please someone help me.

My furnace Lennox G20Q3/4E-100-5 behaves as follows:
1) Fan is on "Auto"
2) Thermostat calls for heat
3) Green light comes "On" on IPI module and then burner comes "On"...

Hi "hwuaijuc",

I have similar problem as you had last month with your furnace. It runs perfect on "Fan On" mode through thermostat. When it's on "Auto" mode, the blower doesn't kick on.

Did...