11:47AM | 01/28/05
Member Since: 09/23/03
22 lifetime posts
I have a Lennox G51MP furnace. Just built this house last year and the furnace was installed in November, 3 months ago.

Last night, it was 0 degrees out. When my wife woke up me for work, she said "its feezing". When I went down stairs, the thermostat said 51. The furnace obviously shut off in the middle of the night. And, my wife babysits a 3 month old everymorning.

Luckily, I put a set of gas logs in when I built my house, so I quickly got them burning and within an hour the living room was toasty. However the basement is freezing as well as the upstairs.

I got out my manual from lennox and read the trouble shooting guide.

When the furnace first comes on, both the Red and Green LEDs blink fast, which the manual indicates as normal operation.

It goes through this cycle and then attempts to light... You see the pilot light come on, then a flame, then the flame goes out.

It does this seeral times for about 3-4 minutes then finally shuts down altogether.

Now, A different code come up. Alternating slow flashing red and green. The manua indicates the follwing.

"Watchguard-Burners failed to ignite, limit open longer than 3 minutes, or flame sense lost 5 times in one heating cycle."

Can anybody tell me what I need to do to fix it????

Is there a part that is malfunctioning?

Please, if you know the cause of this, give me some advice.

My furnace guy is out of town until monday.




11:27AM | 01/29/05
Member Since: 12/19/04
62 lifetime posts
If your lucky and it isn't a failed electronic part you can check a couple of things. Make sure your vent pipe an dintake pipe are clear. The drain hose is not kinked and then turn the switch off at the furnace and tighten any connections that you see inside the furnace. Just repaired my brothers furnace two nights ago and it was loose connections on a relay.

Good luck and stay warm.



04:49PM | 01/29/05
Member Since: 12/16/04
54 lifetime posts
Either a bad flame sensor, or bad connection at the flame sensor. Make sure you have a good ground to the unit and you may check the polarity to the furnace, sometimes the ignition control will work with reversed polarity until the flame starts, then the electrical curent flows through the sensor improperly and flame rectification does not occur.


Post a reply as Anonymous

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


type the code from the image


Post_new_button or Login_button

The “Briolette” faceted glass sink from Kohler measures 17.5” wide and is sure to catch the eye—as it does the light. $707.50 Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... For some decorative recycling, consider burying old bottles upside down to create edging for your garden beds and walkways... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon