Lennox Furnace Question - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 02-29-2012, 09:22 PM   #1
Newbie
 
Join Date: Feb 2012
Posts: 5
Rewards Points: 10
Default

Lennox Furnace Question


I have a G23Q3 4-100-6. The blower will not come on in auto and the furnace does not stay on for more than a couple of minutes without the blower. it will work if i keep the blower on in manual and just leave the blower on all the time. do you think i need to replace the blower control board? is this a hard job?

Advertisement

Mphawki is offline   Reply With Quote
Old 02-29-2012, 09:27 PM   #2
HVAC Tech/ Browns Fan
 
Join Date: Dec 2009
Location: Dayton, ohio
Posts: 541
Rewards Points: 500
Default

Lennox Furnace Question


Its going to be fan relay. Control board is going to need replaced. Google lennox part plus and you be able find the part.

Advertisement

Tator1076 is offline   Reply With Quote
Old 02-29-2012, 09:41 PM   #3
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,472
Rewards Points: 504
Default

Lennox Furnace Question


Until you replace the board leave the thermostat fan selection in the ON position and you should be able to have heat.
__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
The Following User Says Thank You to Plumber101 For This Useful Post:
ben's plumbing (02-29-2012)
Old 02-29-2012, 09:52 PM   #4
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

Lennox Furnace Question


Very simple to change.
Marty S. is offline   Reply With Quote
Old 03-08-2012, 12:56 PM   #5
Newbie
 
Join Date: Feb 2012
Posts: 5
Rewards Points: 10
Default

Lennox Furnace Question


Thank you for your answers so far!!!
I replaced the control board and still have the same problem - the cold air return fan is not coming on in auto, but seems to be fine in the on position and the fan blowing continuously.
Any other suggestions??
Thanks!!
Mphawki is offline   Reply With Quote
Old 03-08-2012, 02:57 PM   #6
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,550
Rewards Points: 616
Default

Lennox Furnace Question


Weird furnace fault.
Your thermostat circuit through "G" on the board does turn on the fan but the timer control & fan relay on the board does not.

What is the led diagnostic light showing?

The usual things that would turn on the furnace fan or not, after the ignition sequence, are integral to the mother board.
how is online now   Reply With Quote
Old 03-08-2012, 03:27 PM   #7
Newbie
 
Join Date: Feb 2012
Posts: 5
Rewards Points: 10
Default

Lennox Furnace Question


Thanks for replying How!
The diognostic lights both just blink steady, which i am pretty sure is normal operation. Could it be the blower motor capacitor? what would be the symptom if this capacitor went bad?
Thanks for your help!
Mphawki is offline   Reply With Quote
Old 03-08-2012, 05:01 PM   #8
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,550
Rewards Points: 616
Default

Lennox Furnace Question


The motor, capaciter, motor leads or their connections to the board could be questioned Except they are already working OK through a thermostatic fan on call.

The other oddity is when you call for heat and the motor doesn't come on, the furnace should overheat, limit out and produce a led code for an open limit.
I think what you are saying is that as soon as the boards timer attempts to turn on the fan motor, the burners shut right off. Everything keeps pointing back to a faulty board which is little comfort to you with a brand new board.
Your furnace manual should list the adjustable settings on the board for how long the delay is before the fan comes on. When you confirm the length of that delay setting on the board, is it the same length of time that the burners are running?
how is online now   Reply With Quote
Old 03-08-2012, 05:35 PM   #9
Newbie
 
Join Date: Feb 2012
Posts: 5
Rewards Points: 10
Default

Lennox Furnace Question


I had to go from a surelight 24L8501 control board to a 83M00. The boards are not quite the same, but i think i got it right - the only wires that i wasn't sure about were the 3 that went from the 120 vac return neutrals on the existing board to the replacement board - the instructions were not specific about where these neutral wires had to go. would those wires possibly be causing issues?
Mphawki is offline   Reply With Quote
Old 03-08-2012, 05:48 PM   #10
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,550
Rewards Points: 616
Default

Lennox Furnace Question


No. but one of the lennox sharp shooters around here may have some info on the differences between those two boards.
In the meantime follow through on answering posting 8 and make sure all your ground lines on the furnace are completely tight as that can cause damage and erratic actions to boards.

Last edited by how; 03-08-2012 at 05:54 PM.
how is online now   Reply With Quote
Old 03-09-2012, 10:39 AM   #11
Newbie
 
Join Date: Feb 2012
Posts: 5
Rewards Points: 10
Default

Lennox Furnace Question


Thanks How for staying with me!
I feel a little stupid... I ended up taking the flame sensor out and cleaning it up - now everything appears to run good. A hard lesson to learn - i did not need to spend $179 on a new control board. Anyway thanks for the responses!!
Mphawki is offline   Reply With Quote
Old 03-09-2012, 12:05 PM   #12
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,550
Rewards Points: 616
Default

Lennox Furnace Question


I'm pleased that it's working....
It doesn't really explain why your board didn't show a diagnostic code for a faulty ignition/ sensor unless your access to that board is by opening a furnace door with a powered door switch?

Advertisement

how is online now   Reply With Quote
Reply


Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lennox 80MGF gas furnace question pdxsk HVAC 19 12-12-2014 04:04 PM
Wiring question for Trane furnace rvmeush HVAC 1 02-27-2012 10:04 PM
Gas furnace exhaust vent question nowell HVAC 7 01-30-2012 09:31 AM
Furnace port, and combustion chamber crack question. cjf1980 HVAC 0 07-27-2009 10:23 PM
Electric Furnace question whatsthis HVAC 32 04-08-2009 08:39 AM




Top of Page | View New Posts