04:06PM | 12/07/07
Member Since: 10/15/02
359 lifetime posts
I have a few year old GMNT I installed myself and had checked out by a pro installer so I know it was installed properly. The burners recently started making noise a few minutes after lighting up. Today when I came home the furnace was in lock down and after power cycling it, the burners wouldn't light. Turns out one burner was over heating and melted the wires for the flame sensor and igniter. I have since repaired the wiring and moved them off the top of the burner cage, but still have the issue with the hot noisy burner. Would this be a deposit issue with the burners that a cleaning should fix, or would it be the tube in the heat exchanger itself causing this? This is a GMNT 120-4 98% efficient furnace. Aside from the noisy burner it is running fine, but the fact it melted the wires has me concerned. One of the flame sensors had also tripped.


08:32AM | 12/08/07
Member Since: 10/15/02
359 lifetime posts
It is a GMNT 120-5. I tore down the burner assembly this morning and cleaned them all up, then found the flue collector has a crack in it right down the middle to the blower. I tore that off, cleaned it all out, got some high temp silicone and sealed the crack, blew out the tubes in the exchanger, and put it all back together, sealing the flue to the exchanger with fresh silicone on the old gasket. Started it back up and smiled because it was quiet, that is until the main blower kicked in and it started rumbling again. It appears the 3rd tube from the left is getting air in it from the blower. The furnace was installed in 2002 so it is still under the 5 year parts warranty and lifetime heat exchanger, but I installed the furnace myself, so I dont know what to do to get a replacement without having to first teardown the furnace and ship the old one back and wait for a new one in the winter, gets mighty cold here.


10:12AM | 12/08/07
Member Since: 10/15/02
359 lifetime posts
I have a friend who does HVAC, he actually moved the A coil for me to the new furnace off my old one when I installed this one and checked my other furnace install and OK'd it for me. I haven't talked to him since 2003 when he was here last time, I will give him a shout and see what he can do. Replacing it myself doesn't seem to be a problem since I darn near go everything in front of it off this morning while cleaning and repairing the flue cover. Doesn't hold up well for Goodman/Janitrol when the HE doesn't last 5 years. Our old house had a Lenox Pulse installed that only needed one repair in 15 years, and that was a relay that I was able to get just about anywhere, and I heard the pulse furnace had problems, but not the one we had.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.



Post_new_button or Login_button

To test the boundaries of small-footprint living, interior designer Jessica Helgerson moved her family to a 540-square-foo... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled mudroom will get you in the outdoor mood. Grab your coat ... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR carpet tiles are a simple and affordable way to customize a floor covering for any space. You can make anything from ... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... Dark wood shelving and a matching upholstered bench keep this closet sleek and refined. The large window brightens the sub...
Newsletter_icon Flipboard-glossy Facebook Twitter Pinterest Youtube Rss_icon