08:09PM | 03/28/03
Member Since: 12/26/00
13 lifetime posts
My 6 year old, Lennox GHR26 furnace decided to quit today. The thermostat appears to be working as I can hear it click to call the furnace to provide heat. Also the fan does not work in manual mode.

I've performed these checks: breakers OK, no diagnostic code flashes at the PCB, gas valve on, furnace switch on, appears to have power to the furnace, and gas meter valve is on.

Troubleshooting ideas are appreciated.


12:06PM | 03/31/03
Member Since: 12/26/00
13 lifetime posts
FYI the control board had a hot spot and delamination, and a local company service tech replaced it. I read on the 'net this board was replaced by Lennox by a different model; unfortunately mine lasted through the warranty period.


04:37AM | 02/03/07
Member Since: 02/02/07
2 lifetime posts
In my subdivision all the houses were built with either the G23 or G26 series furnaces. It seems they have a 6 year life span as probably 3/4 of all the houses have needed to have some form of repair this year. All the houses are 6-7 years old.

For what its worth you can find information, including wiring schematics, troubleshooting guides, flowcharts and more at the following link:

I have been working on repairing mine myself. I paid for a service call but the furnace still continues to malfunction. Almost everyone I call tells me that the Lennox furnaces are crap and even some parts stores dont sell Lennox parts because they say Lennox is a pain to deal with.

For the G26 series typical part numbers are as follows:

Main blower: 45H33

this cross references to emmerson motor model K55HXND-4565

average price I found $250

Induction motor: Lennox 49L5301

also listed as Fasco part number 7021-10841

this part ranges from $100 to $300 so look around to save money.

Flame sensor: lennox 40L81

Price $60.00 - $175 so again, look around.

Circuit board: Lennox 24L8501

Price $100-$350

Pressure switch: lennox 63k9301

prices $30-$275

You can also find some used items out there because a lot of my neighbors just replaced their whole units.

My advice... Dont buy Lennox if you have a choice. They dont seem to have a good reputation as I have witnessed a very high failure rate. Parts are available but you will need to spend some resonable time if you dont want to get robbed.

Dont bother going to the Lennox website either. Its about as useless as the furnace in my house right now!


06:21AM | 02/03/07
Member Since: 02/02/07
2 lifetime posts
My issue with my GHR26 series is that even with the scheduled maintenance I am still having issues. When you really look at it there isnt that much to a furnace. The problem is that as you look at it you start to see that (like everything else) its just made so poorly. I understand they need to keep costs down to remain competitive but at the cost of their reputation and reliability it hardly seems worth it to me.

I'm absolutely amazed at the pricing differences between parts suppliers as well. I can show you several examples of $50 to $250 dollar price differences for the exact same part. The internet is a great tool for comparrison shopping. I suggest that anyone out there looking to do these repairs themselves, or simply looking to verify costs use it.

My unit has no problem with the main board but since I was looking up parts it came across the screen when I searched by model. Honestly, that was the easiest part to find online because the part number is right on the front of it. Other items like the flame sensor and ignitor arent as easy. There is very little technical information out there for this unit so I thought it would be helpful to the next poor sucker like me if he didnt need to waste time looking.

I posted info on the blower motors as its good for people to know what this stuff costs. If your motor goes its really not a big deal but some people dont understand that and if they get a high estimate they may end up making a bad decision. If you open up the front of my unit (model GHR26Q3-75-6) I could swap out both motors in less than an hour myself and pay only about 200-300 dollars. Work could all be done with basic tools and a bit of caution.

Honestly I have pulled and cleaned my flame sensor myself and it doesnt warrant the $200 bill I was getting by having it done. Funny thng is that as called around the $200 estimate was one of the cheapest I got. I stood behind and the guy and realized there's no magic to this. Maybe thats not for everybody but it saves me $200 a year.


01:04PM | 02/08/07
Member Since: 01/23/05
4 lifetime posts
back when the unit was under warranty, i was able to get ignitors and replace them when needed myself, easy job, and they seemed to go out often...

the unit has been highly problematic, most problems were ignitor related, the ignitor wire where it connects to the main board, the flame sensor, and finally, this year, the main board itself, which i had replaced to the tune of $485 including diagnosis and labor (i was out of town, and glad to have it done).

for the amount of money i've put into the thing, during my learning curve, and for having it fixed when i'm not there to fix it (i live out of town and a friend of mine lives in the house in my absence)... i could have bought a brand new high efficiency goodman, or other brand perhaps, and had a nice long warranty...

now, hopefully, i'll get a couple trouble free years out of it and let that main board pay for itself.


02:58PM | 01/06/14
My parents replaced their furnace a few years back with a Lennox. Since then the electric bill has increased 100%. They have been getting notices from the electric company saying that their electric bill is three times higher than surrounding neighbors with equal size homes. When cold weather starts their electric bill goes from $200 to $400+. Seems somewhat high for a 1200 square foot house in Central KY. The new furnace has been checked several times by the installers but they say it works fine. Imagine that. Does anyone have any idea what the problem could be.


01:58PM | 02/27/16
Member Since: 02/27/16
1 lifetime posts
It sounds like this has been talked about alot and I'm new to the problem. I have the same heater malfunction problem. I looked at the flame sensor current and it reads 9.4 ua without flame. When the flame comes on it doesn't change. This doesn't sound right to me. Does anyone have any idea if this could be the sensor or the control board?
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