Lennox - Heating, Ventilation, and Air Conditioning (HVAC) - Do-It-Yourself Appliance Repair Help - ApplianceGuru.com: The Samurai Appliance Repair Forums

ApplianceGuru.com: The Samurai Appliance Repair Forums Home

ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > Lennox

Konnichiwa and Welcome!

Please register to post a question. It's FREE!

SEARCH THIS SITE
We have a bizillion pages of specific appliance repair questions and answers here just aching for the furtive caress of your engorged and tingling eyeballs. Use this search box to find ‘em.

FIND PARTS FAST
Search by part number or model number. You can also search by appliance type, brand, or even the type of part.

Moderated by: RegUS_PatOff, hvacdrd, applianceman18007260692

New Topic

Printer Friendly

Lennox

Rate Topic

Author	Post

Posted: Tue Jan 13th, 2009 05:47 pm

Quote

1^st Post

wesgarrison
Senior Apprentice Appliantologist

Joined:	Tue Jan 13th, 2009
Location:
Posts:	2
Flavorite Brew:	Boulevard Wheat
Skype:
Status:	Offline

First time poster, I'm hoping someone can give me a hand.

I've got a gas furnace that ignites, but won't stay lit.

It's a Lennox 80MGF3-75A-5 . See pics for details.

Here's the sequence of events:

thermostat sends ON signal
small blower above starts
~10 seconds elapse
ignitor spark starts clicking
gas turns on and I can see flame on all five burners
ignitor keeps clicking
burners run for 10 seconds-ish (with the ignitor still on)
burners and ignitor shut off
repeat, total of five times
fan shuts off
circuit board shows alternating LEDs

The message on the panel for the alternating LEDs is:

Watchguard - burner failed to ignite

I had a service call and he wants to replace everything for $1000 or sell me a new furnace. Seems to me that everything is working, it just won't stay on. Perhaps this is a common issue with this brand?

Any advice much appreciated.

EDIT:
Sorry, I meant to put more info in the title. If a mod sees this and wants to update the title appropriately, that'd be nice. I can't find where to do it.

Last edited on Tue Jan 13th, 2009 05:49 pm by wesgarrison

____________________
-- Wes

Quote

Posted: Tue Jan 13th, 2009 07:06 pm

Quote

2^nd Post

RegUS_PatOff
Fellow, Academy of Sublime Masters of Appliantology

Joined:	Sat Sep 24th, 2005
Location:	Milwaukee, Wisconsin USA
Posts:	10982
Flavorite Brew:	Indian Head. Black & White
Skype:
Status:	Online

I'm no expert, but how's the Flame Sensor ?

80MGF Service Manual

____________________

RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw

my video production: “Easter Seals Walk With Me” (also in HQ) http://www.youtube.com/watch?v=-EBiLyYXMiA

Upon leaving this Earth "Do you want the Smoking or Non-Smoking section ?"

Quote

Posted: Tue Jan 13th, 2009 08:11 pm

Quote

3^rd Post

wesgarrison
Senior Apprentice Appliantologist

Joined:	Tue Jan 13th, 2009
Location:
Posts:	2
Flavorite Brew:	Boulevard Wheat
Skype:
Status:	Offline

Dirty, dirty sensor. Thanks for the link to the manual, it helps to know what all the parts are!

I pulled apart the five burners, cleaned both the flame sensor and the ignitor, got all the dust out of the burner cones, and put it all back together.

It's started up several times in a row just fine.

Thanks a bunch!

____________________
-- Wes

Quote

Current time is 07:32 pm
ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > Lennox	Top

Your Sometimes-Lucid Host:

"If I can't help you fix your appliance and make you 100% satisfied, I will come to your home and slice open my belly, spilling my steaming entrails onto your floor."