Problems with Lennox G51
Hi there everyone I work for a lennox dealer and I thought I would fill you in on some of the issues we've had with the Lennox G51.
Well let me start with propane aplications. Depending on the quality of propane, the pressure switch port on the bottom left hand side of the collector box seems to get pluged up with a white residue (maybe sulfur). It seems that you need to take of the colector box once a year and wash it out.
On the G51-1 series, any ventor motor that has a black wheel will more than likely crack in the first 5 years (material issue)
On the G51 with the updated white rodgers surelight board (either a dash 1 or dash 2 on the part number of the board not the model nuber of the furnace), we've had issues with the blower relays not closing and the pressure switch relays not closing.
Lennox has adressed the issue with the ventor motors by issuing a voluntary recall (good for one year), however they havent adressed the issue with their newer (cheaper) surelight boards.
I havent had any recuring issues with their G61mp or G61mpv models other than the pressure switch port being pluged in some cases when being used with propane.
Their new G71 units in my opinion are too advanced and the end consumer will never see the true benifit of thier aplication when compared to the operation of the G61.
I believe that there is a bulletin on propane applications for collector boxes that replaces the collector boxes and the ports are "lined" with something to keep this from happening.
way to take away his glory run......
Originally Posted by pacnw
Just couldn't let em have his moment could ya????
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.
if you work for a Lennox dealer you should know about the inserts for the collector box problem.............
the blower problem has been corrected .
surelight board has been the most reliable ignition i have seen in my 30+ years ofworking on electronic ignitions.......
Service bulletins are like install instructions. Worthless if you don't read them.
Originally Posted by pacnw
Have you been to a class on the G71? I found it very interesting.
Last edited by fd3687; 06-24-2008 at 09:16 AM.
Reason: Double post
Ya I attended the G71 seminar about two months ago and its was really intresting. Question is, will this new system really offer that much more benifit compared to the G61.
About the lining in the collector box, thats news to me. Thanks. I spoke to the counter guys and our TM about this issue 6 months ago and no one could offer me any advise.
The new surelight boards for the g51 are junk. They are using really cheap chinese made reallys on these boards and they have a failure rate of 80% (80% of our boards of failed within the first two years). However the surelight boards for the G61 doesnt have this problem. I think Lennox is trying to use cheaper components on their base line to try and compete with cheaper products.
What manufacurers aren't? Everyone has to compete with Goodmana. Thanks Goodman! You're taking the quality out of everyones product.
Originally Posted by fd3687
I think all of the new G51 boards are back to the way they used to be, and the furnace is probably one of the most reliable out there.
Originally Posted by heatingairman
so you think its all goodman's fault, come on you can think of a better answer than that!
I also work for a lennox dealer, never changed a board. I have changed a few cold headers, recommended by lennox rep. I could not tell the difference between the old and new design. I own a G71 and the end user will defintly benefit with the variable capacity. I notice the floor by the supply vents is so much warmer, its like a radiant heat. The furnace is so quiet. I work service.
I have a G51 with a intermintent problen and I think it is the surelight board! please help me conferm.
The LED's would fast flash alternatly. I would shut the power off and then turn it back on and it would work. I had a furnace tech come out to my house it check it out. The Tech told me that it was probably one of the cards to he was not sure and the only way to trouble shoot it was to replace the cards and see if it fixed the problem. He told me that he could not do this under warrenty so I figured that I would just keep turning the power off and on when it quite working. This was about 2 years ago.
Now the problem is becomeing more fequent and sometime have to turn the power on and off, on and off, on and off or a long time sometimes half an hour, to get it to work. Sometime I hear a relay clicking on and off(sounds like a bad connection) The Board has a sticker on it with this information:
Made in mexico
Does this sound like I need a new board or could it be something else? If It is the board Where do I get one? is there and different manufacture that made a comperable board that isnt a P.O.S..
If you dont think it is the board what else do you think it could be. I dont know a lot about gas furnaces but I believe the tach that told me he thinks it is the card was compitent?
Any idea what the cards cost?
It is warm now and I would like to get it fixed befor fall is hear and it is cold again. My heater is model number: G5IMP-36B-045-01 and Serial number is: 5803G37210.
Call the service company to come out when its not working.
Its easier to find the problem when it is in a non functional state.
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