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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-06-2012, 11:13 AM   #1
Newbie
 
Join Date: Jan 2012
Posts: 5
Share |
Default

Lennox Heater


when it kicks on the fan starts to blow out the ducts, then it is supposed to ignite and start to heat. After being off for a while, when it kicks on the fan will start but it will not go to ignition. if I pound on it a few times it will kick in the ignition and work just fine.

Richard Hayden is offline   Reply With Quote
Old 01-06-2012, 11:25 AM   #2
I'm Your Huckleberry
 
Join Date: Mar 2011
Posts: 5,756
Default

Lennox Heater


Post the model and serial number of your Lennox furnace.

__________________
Thanks.
Doc Holliday is offline   Reply With Quote
Old 01-06-2012, 11:38 AM   #3
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,491
Default

Lennox Heater


Age and lennox model will help us.
I am guessing that you are saying that the main fan can work but not the inducer motor.
You should look for a flashing led light (lights) that may be visable through the furnace grill or an inspection port in the furnace door. Check for them without opening up the blower door. The number and way it will flash will match a explanation legend inside the furnace door that will explain the cause of your problem.
how is online now   Reply With Quote
Old 01-06-2012, 11:41 AM   #4
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,410
Default

Lennox Heater


Get a bigger hammer.
__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 01-06-2012, 12:14 PM   #5
Newbie
 
Join Date: Jan 2012
Posts: 5
Default

Lennox Heater


Age of heater 02/95 Mod.# G24M3/4-100A-2
Richard Hayden is offline   Reply With Quote
Old 01-06-2012, 12:21 PM   #6
Member
 
Join Date: Feb 2007
Location: NW Ohio
Posts: 804
Default

Lennox Heater


Quote:
Originally Posted by Richard Hayden View Post
Age of heater 02/95 Mod.# G24M3/4-100A-2
the proper sequence of operation is as follows:
1. Tstat call for heat
2. inducer motor starts and closes pressure switch
3. after a short pre purge igntor will be energized
4. gas valve is energized and delivers gas to manifold and burners
5. gas ignites
6. flame sensor senses flame (must happen within 4 seconds)
7. main blower is energized
8. tstat is satisfied and inducer is de-energized
9. main blower de-energized

with all that being said at what point is your unit getting to ?
harleyrider is offline   Reply With Quote
Old 01-06-2012, 12:21 PM   #7
Newbie
 
Join Date: Jan 2012
Posts: 5
Default

Lennox Heater


Heater is 17 years old (02/95) and model #G24M3/4-100A-2
Richard Hayden is offline   Reply With Quote
Old 01-06-2012, 12:22 PM   #8
Newbie
 
Join Date: Jan 2012
Posts: 5
Default

Lennox Heater


igniter doesnt energize.
Richard Hayden is offline   Reply With Quote
Old 01-06-2012, 12:29 PM   #9
Member
 
Join Date: Feb 2007
Location: NW Ohio
Posts: 804
Default

Lennox Heater


Quote:
Originally Posted by Richard Hayden View Post
igniter doesnt energize.
ok, are you able to get a fault code off of the board? pounding on it is not recomended, but it tell me that a connector may be bad, or the board may be going out.
harleyrider is offline   Reply With Quote
Old 01-06-2012, 12:37 PM   #10
Newbie
 
Join Date: Jan 2012
Posts: 5
Default

Lennox Heater


No code. The red light blinks constantly, no breaks.
Richard Hayden is offline   Reply With Quote
Old 01-06-2012, 02:32 PM   #11
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,491
Default

Lennox Heater


Your board should be giving you a fault code. The fact that it isn't and that physical pounding can get it to sometimes work, points to a board fault. A poor ground wire can damage a board over time or make it respond erratically.
The first two things I'd first test would be..
Check that all the green ground wires for the furnace are tightly secured.
Next, with the power off, I would try pushing all the wires on the board further into their plug connections. Turn the power back on and try the furnace through a heating cycle again.

how is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Pilot on Williams millivolt wall heater goes out every 8 to 16 hours wornways HVAC 30 06-22-2011 03:29 PM
Lennox G61 quote, also water heater and ac bw77 HVAC 1 06-16-2011 07:12 PM
Lennox Crank case heater wayne1178 HVAC 18 04-29-2011 09:05 PM
Lennox Heater Light flashing Jake Spain HVAC 1 12-17-2010 09:32 PM
Lennox Gas Heater will not stay lit buddickman HVAC 1 11-23-2010 05:23 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.