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Old 10-06-2009, 03:57 AM   #1
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lennox conservator g11e problem


I have the above mentioned furnace and when i went to use it this fall this is what is happening. When the thermostat calls for heat the electronic pilot(igniter) kicks on and makes a spark for several seconds but does not light the furnace. If i turn down the thermo and try it again it lights sometimes. (usually on the 3rd try it lights and works fine) any thoughts?


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Old 10-06-2009, 05:49 AM   #2
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is your ignition control board a johnson controls model? i looked around and found similar problems with lennox and one of the remedies was that the board was bad and needed replacing.




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Old 10-06-2009, 06:02 AM   #3
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A G11?

Thats 30 some years old. HX needs checked for cracks.
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Old 10-06-2009, 01:42 PM   #4
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i dont see a board of any kind. The only thing i see is a covered box marked honeywell with 3 big wires going in and 2 coming out and then a pilot contol box and it doesnt have a name on it just a model #g60qhl1. I know its old, i had it checked a few years ago but i am hoping to get 1 more year out of it. I had to replace my windows this year,,,still waiting on that to be done and next year is hopefully going to be a new heating and cooling system. Is there a way i can check the hx myself?
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Old 10-06-2009, 02:14 PM   #5
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lennox conservator g11e problem


I think this furnace uses the johnson module that mounts to the gas valve. They can be swapped for a universal module but takes some engineering to make it work. I would do as suggested and have the heat exchanger inspected.
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Old 10-06-2009, 02:37 PM   #6
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it is mounted to the gas valve
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Old 10-07-2009, 02:25 AM   #7
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i have a tech coming out this morning to take a look at it. Hopefully i can get through another winter with it. IF i have to get a new furnace i will want to replace the ac along with it. It seems everyone is going with a heat pump and furnace system. Are these better than an ac unit and a heater?
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Old 10-07-2009, 03:10 AM   #8
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Quote:
Originally Posted by beenthere View Post
A G11?

Thats 30 some years old. HX needs checked for cracks.
do you think its really that old? even with an electronic ignition system? I am not doubting you just another question..
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Old 10-07-2009, 05:23 AM   #9
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Quote:
Originally Posted by AWILLIAMS64 View Post
do you think its really that old? even with an electronic ignition system? I am not doubting you just another question..
Yes. Electronic ignition has been around a long long time.

I could be off by a few years. And may be its only 28 years old.
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Old 10-07-2009, 09:54 AM   #10
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i had the tech come out this morning and guess what, heat exchanger has a large crack in each bank. I am now waiting to get an estimate on a new furnace and heat pump. He didnt even charge me for the service call and got it working for now.
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Old 10-07-2009, 11:34 AM   #11
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Ah.... the Revenge of the Dura-Curve strikes again!
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Old 10-07-2009, 12:05 PM   #12
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Quote:
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Ah.... the Revenge of the Dura-Curve strikes again!
not quite sure what that means. I got a quote for an american standard 100k 90+ gas furnace with a 3t heat pump for $4500 installed. or just the furnace for $2000 installed. My central air was put in in 1991 so i am leaning toward a whole new system.
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Old 10-07-2009, 12:07 PM   #13
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lennox conservator g11e problem


What I meant was there have been numerous issues with the Lennox Dura-Curve design, resulting in HX cracks. I just recently changed mine, because of this same issue. That is also why many have posted to you to have it checked for cracks.
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Old 10-07-2009, 12:27 PM   #14
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lennox conservator g11e problem


Ask them to do a load calc. And see if that is the size you really need.
They may be sizing by sq ft. Which just cost you more money.

You can do your own, if you want. HVAC Calc

It has a 49 dollar fee.
But is well worth it.
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Old 10-07-2009, 12:30 PM   #15
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Now to the next step. How did they come to the conclusion as to what size system you need? Did they perform a manual J load calc? If they just guessed from sq footage or old equipment size then you will not be sized properly.

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