lennox G20Q3E-75-4

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Old 12-04-07, 11:04 AM
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lennox G20Q3E-75-4

I need to clean or replace my flame sensor in lennox G20Q3E-75-4 gas forced air furnace. The burners are removable-I watched service tech do it. The burner sits over a Nipple embedded in the gas mainfold. It slides almost off of the nipple then stops. I think I am hitting the back of the heat exchanger while trying to free the burner from the nipple(spud). Any suggestions on how it comes off. I thought about unscrewng the nipple from the manifold. Is that a good idea? Thanks.
 

Last edited by Koolbreaze; 12-04-07 at 11:22 AM. Reason: misspelling
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Old 12-05-07, 08:10 PM
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Lennox G20Q3E-75-4 blowing cold air solved.

Whew! I never got that burner off. But I kept thinking to myself, I saw the tech clean that sensor. I could see it was not physically broken so I decided to go the route that maybe the sensor was ok and the electronic ignition control module could be faulty. It was. Unfortunately, I didn't have the equipment to test for the current from the sensor. I called the tech back out, figuring if it was the sensor, he could take the burners out for me. If it was the module, he would have the ampmeter to test for the sense signal. It cost me an emergency call of $150. He wanted to sell me the module for $325. I told him no thanks. I had already priced it at cozyparts for $154. Better yet, I found an Appliance supply store in my area 10 minutes away. I paid $187, but I have heat now. I think I'll invest in a better meter. By the way the replacement was a Honeywell with Lennox part number 30W33. The original Robert Shaw unit has been dicontinued. The directions were straight forward and I was up in running in no time.
 
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Old 12-08-07, 02:07 PM
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Originally Posted by Koolbreaze View Post
Whew! I never got that burner off. But I kept thinking to myself, I saw the tech clean that sensor. I could see it was not physically broken so I decided to go the route that maybe the sensor was ok and the electronic ignition control module could be faulty. It was. Unfortunately, I didn't have the equipment to test for the current from the sensor. I called the tech back out, figuring if it was the sensor, he could take the burners out for me. If it was the module, he would have the ampmeter to test for the sense signal. It cost me an emergency call of $150. He wanted to sell me the module for $325. I told him no thanks. I had already priced it at cozyparts for $154. Better yet, I found an Appliance supply store in my area 10 minutes away. I paid $187, but I have heat now. I think I'll invest in a better meter. By the way the replacement was a Honeywell with Lennox part number 30W33. The original Robert Shaw unit has been dicontinued. The directions were straight forward and I was up in running in no time.
The G20's are horrible for ignition control problems, Lennox is now on its 3rd style "improved" ignition control board for that model. second series i have not had much of a problem with but the original is terrible
 
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