Lennox G40UH(X) Series Furnace
#1
12-12-10, 02:27 PM
Join Date: Dec 2010
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Lennox G40UH(X) Series Furnace
My furnace won't heat continually. The fan turns on, and the burners will turn on for only a couple seconds, then shut off. This will happen 4 times, and then stop completely. The indicator lights are "alternating slow" flashing. The manual says it's in "watchguard", but the manual gives no help on how to fix it. Is this a doityourself fix, or do I need to call someone?
FYI--Temps are in the single digits or below zero this weekend end and it's getting pretty cold, any help would be greatly appreciated.
FYI--Temps are in the single digits or below zero this weekend end and it's getting pretty cold, any help would be greatly appreciated.
#2
12-12-10, 03:15 PM
Banned. Rule And/Or Policy Violation
The flame sensor tends to get covered with invisible oxides so the control module can't verify that the main burners are lit, so it shuts off the main burner gas and tries again.
The flame sensor is on the opposite side of the furnace from the hot surface ignitor. It's a small rod that sticks up into the burner flame with a wire going back to the control module.
Remove the flame sensor and clean it with a wire brush. Reinstall it and try again.
Cleaning the flame sensor annually is part of furnace maintenance.
The flame sensor is on the opposite side of the furnace from the hot surface ignitor. It's a small rod that sticks up into the burner flame with a wire going back to the control module.
Remove the flame sensor and clean it with a wire brush. Reinstall it and try again.
Cleaning the flame sensor annually is part of furnace maintenance.
#4
12-14-10, 07:56 PM
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I am also having same issues, would you be able to help me locate the flame sensor? Funny thing about this is that some times it works fine for a few days, and sometimes it needs to be turned off and back on.
#5
12-14-10, 09:17 PM
Banned. Rule And/Or Policy Violation
It rapidly becomes confusing when people piggyback one problem on top of another --- and VERY OFTEN, what people think are the same problems are not.
So my suggestion is to start a new thread and re post the problem you are having with your furnace.
So my suggestion is to start a new thread and re post the problem you are having with your furnace.
#6
12-27-10, 07:06 AM
Thank You so much with this great information. My problem was the same as others. I just got on here and the answer solved mine. Thank You again. By the way I have G50DF-36-070-03
#7
01-11-11, 05:59 PM
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#8
03-03-13, 11:44 AM
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Dude!
THAAAAAANK YOOOOOOOU! 5 kids + 3AM + 6 degrees + no heat + no money = Bad.
+ your help... dad is now a hero and my family are not ice cubes!
+ your help... dad is now a hero and my family are not ice cubes!
