Lennox G26 keeps blowing cold air


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Old 01-15-07, 05:35 PM
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Lennox G26 keeps blowing cold air

Gas furnace installed in '95. Electronic pilot light
Sometimes shutting the unit off and turning it back on later helps,or turning thermostat all the way down then back up after a few minutes, other times I have to remove the panel where the interlock switch is. It usually heats over the setpoint of the thermostat then blows cold air or when it reaches the temp on the thermostat it blows cold air until i reset it again somehow. Is it the thermostat? And are the programmable t-stats as easy to install as they say on the box.
 
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Old 01-15-07, 07:47 PM
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Does your current T-stat have a lever or switch that says "auto" or "manual" or "on"? Sounds like it got bumped to the manual or on position.
Programmable T-stats are generally easy to install. Before buying one, check your old one and see how many wires it has - usually 2 or 4 and get the proper replacement.
 
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Old 01-16-07, 08:04 AM
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not it

no. the t-stat has a cool-off-heat setting one one side and fan on-auto on the other. I'm seeing on the web that this happens a lot to Lennox furnaces. I just haven't found the solution yet.
 
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Old 01-16-07, 10:32 AM
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Sounds like an ignition control board. Is it blue?
 
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Old 01-17-07, 10:36 PM
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huh?

I'm not sure what the ignition board is.
 
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Old 01-18-07, 01:02 AM
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Originally Posted by gbgomab View Post
I'm not sure what the ignition board is.
...Then you shouldn't be working on your own furnace. It's time to call a technician.
 
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Old 01-20-07, 08:59 AM
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BUMP YOU Muggle!! the peanut gallery is over that way - - > so beat it!
Yes, the board is blue. It is loose(only 1 screw holding it in place), but all the wire connections are tight.
 
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Old 01-20-07, 11:37 AM
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Its probably the board.
 
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Old 01-22-07, 05:23 PM
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Similar Issues Resolved

Just had my blue ignition control box swapped out with the Honeywell part. $287 installed. Part was $175. I have a Lennox G26 series as well. I was told by two repair techs that the part usually lasts 8 years and mine was installed in '97.

Shutting the power off to the furnace and letting it sit for a minute and then turning the power back on got us through the weekend until repaired.
 
 

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