Do I Need A New Furnace Controller Circuit? - HVAC - DIY Chatroom Home Improvement Forum

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Old 03-13-2012, 01:32 AM   #1
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Do I need a new furnace controller circuit?

So I have some amateur skill at hvac. My brother-in-law is an HVAC tech in the pass he taught me a few things. For reason I will not go into, I do not want to ask him for help. Simply put it he's been a jerk to my sis. So I need a second opinion from you guys (the pros).

One morning I woke up at 3am in the cold. My draft inducer was constantly running but no flame. This is a Lennox Conservator G16, about 20 or more years old. I check a few things and turns out my ignitor was not sparking. The pilot has gas, because when I manually light the pilot everything works. I tested the continuity of the ignitor from the controller connection to the spark electrode and its not continuous. I tested for amperage on the ignitor terminal at the control module an was getting about 3.6amps. I went and purchased a new pilot assembly.

After installing the new pilot, I had the same problem. Ignitor will not spark, and pilot will not light. When lite manually the pilot works and everything on the furnace works. The new thing I notice now is I'm not getting any Amps reading from the ignitor terminal on the control module. So my question is what amperage reading should I be getting at the IGN terminal. Is this reading in AC or DC. I'm not sure what it is because I'm not getting any reading anymore. I know this IGN terminal is intermittent, and will only put out amperage when the control module ignite the pilot. So I have held the ohm meter to the terminal for at least 5minutes from start of heating cycle, and still no reading. Could I have shorted out or burned the control module from my earlier test by doing amp draw on the IGN terminal to a ground? I do not have am amp clamp and used the ohm meter leads? I need a second opinion before purchasing a new furnace control module. By the way this is a no-integrated control module. Will try to attach photo, mine is not that clean. Thanks for you help!


Last edited by ntnher; 03-13-2012 at 01:38 AM. Reason: insert picture
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Old 03-13-2012, 03:18 AM   #2
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you need a new ignition control if it is not sparking but the pilot valve is operating.


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Old 03-13-2012, 04:33 PM   #3
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Did you test the ignition lead & igniter on your new pilot assy for continuity?
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Old 03-13-2012, 08:18 PM   #4
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If I remember those ignition systems had ground issues
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Old 03-13-2012, 10:00 PM   #5
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you have a bad control board.....
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Old 03-13-2012, 10:05 PM   #6
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I would replace a 20 year old furnace before putting any large amount of money into it.


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