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 11-29-2012, 01:12 PM   #1
Newbie
 
Join Date: Nov 2012
Posts: 4
Share |
Question

Lennox Heater still shutting off after 10 min


I have a G43UF Lennox heater (6 years old). Two weeks ago, it began shutting off (after 20-30 sec) for the 3 cycles then getting the alternating red/green lights. So I replaced (NEW) the "Flame Sensor", "Ignitor", and cleaned the burner unit. The heater now stays on for 10+ min but eventually will again flame out for 3 cycles. Additionally, I've replaced the batteries in the thermostat. I'm not sure what else to repair or replace.

Danthemanjr is offline   Reply With Quote
Old 11-29-2012, 01:26 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,259
Default

Lennox Heater still shutting off after 10 min


What code does it give when it flames out after 10 mins?

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Old 11-29-2012, 02:04 PM   #3
Newbie
 
Join Date: Nov 2012
Posts: 4
Default

Lennox Heater still shutting off after 10 min


I don't have it in front of me but it indicated that the problem was Heater is cycling 3 times then shut down or something else (it indicated there could be 1 of 2 problems but mine was the Shutdown after 3 cycles). The lights flash simultaneously when OK but the alternating flashes indicated the 3 cycle problem. After researching, I figured the problem was the Flame Sensor and I also changed the Ignitor but it was functioning just fine. Since I was all the way in, I also cleaned everything.
Danthemanjr is offline   Reply With Quote
Old 11-29-2012, 07:56 PM   #4
Newbie
 
Join Date: Nov 2012
Posts: 7
Default

Lennox Heater still shutting off after 10 min


Could have a problem with a pressure switch sticking. Pull the tubes off of them and blow through the tubes to get any debris the may be in them out.
woodsy4141 is offline   Reply With Quote
Old 11-30-2012, 09:34 PM   #5
Newbie
 
Join Date: Nov 2012
Posts: 4
Default

Lennox Heater still shutting off after 10 min


Thank You, I will try that now.
Danthemanjr is offline   Reply With Quote
Old 12-01-2012, 11:20 PM   #6
Newbie
 
Join Date: Nov 2012
Posts: 12
Default

Lennox Heater still shutting off after 10 min


I know that this sounds simple, but be sure that the flame detector is clean and it is pointing at the flame.
rootboy is offline   Reply With Quote
Old 12-08-2012, 10:51 AM   #7
Newbie
 
Join Date: Nov 2012
Posts: 4
Default

Lennox Heater still shutting off after 10 min


I have a G43UF Lennox heater (6 years old) and is still shutting off after the 4 cycles. Here's what I've done so far: changed the thermostat's batteries, replaced the Flame Sensor and Igniter, removed, cleaned and replaced the burners, all hoses, Inducer Fan and housing, drained and cleaned the condenser trap, replaced the Condensate Pump and it's still shuts down. I think all that's left is the Gas Valve and Circuit board. How can I check now what's the problem? I don't want to pay for more items and they are not faulty. I'm getting very frustrated.
Danthemanjr is offline   Reply With Quote
Old 12-08-2012, 11:30 AM   #8
how
Member
 
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,489
Default

Lennox Heater still shutting off after 10 min


Yuri previously asked you what the diagnostic flash code was but I didn't understand your answer.
how is offline   Reply With Quote
Old 12-08-2012, 03:11 PM   #9
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,786
Default

Lennox Heater still shutting off after 10 min


Merged threads.

beenthere is online now   Reply With Quote
Reply

Tags
flame sensor, lennox, shut off


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
Lennox G23 heater randomly turns on and won't turn off kgold HVAC 6 05-20-2012 05:07 PM
Water Heater Constantly Failing/Replaced DroidGuard12 HVAC 6 04-11-2012 03:41 PM
80 Gallon Water Heater Thermostat myowneq Electrical 26 02-13-2012 10:50 AM
Lennox Heater Light flashing Jake Spain HVAC 1 12-17-2010 09:32 PM
Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler VIPSpecialNeeds HVAC 5 03-15-2010 06:37 PM




Top of Page | View New Posts

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