Lennox G20 blowing cold air


Old 10-18-04, 10:33 PM
Visiting Guest
Posts: n/a
Lennox G20 blowing cold air

I have the Lennox G20 Gas Heating and it is blowing cold air. I can see it igniting in the basement, but only cold air comes form the blower. It barely runs a miunte and shuts off? Any ideas?
Sponsored Links
Old 10-19-04, 05:05 PM
hvac4u's Avatar
Join Date: Aug 2001
Location: NW atlanta
Posts: 3,147
Received 0 Votes on 0 Posts
if it is igniting, not just glowing, i assume the burners either do not completly light or soon go off?

if it is glowing but not lighting, sounds like gas valve is either not opening or gas **** is off
Old 10-20-04, 03:43 PM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 10,440
Received 5 Votes on 4 Posts
Arrow Another Possible Cause

Hello AtomBomb Welcome to the Heating Furnaces forum topic and the Do It Yourself Web Site.

If you can see burner flames but they shut off soon after igniting, may be the flame sensor is dirty or defective.

First turn off all electrical power to the heater and turn the thermostat to the off position or lower the temp to it's lowest possible temp.

Remove the sensor if needed. To clean it, use fine grit sand paper or steel wool. Clean the entire element to remove the rust, scale etc.

If the element has to be removed to perform this task, make note of how it is currently installed and how it is attached to the electronic module, etc prior to removal. Reinstall it exactly as it currently is. At this time also check the flamesensors electrical connection.

Both of these 2 steps, cleaning and checking the connections should or could correct the problem. If not, it's possible the sensor element is defective. Replacing, providing this part is in fact the cause of the problem, is the only solution.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: