Rick Patterson

12:08PM | 02/02/99
I am trying to install Sear# 42-91861 thermostat to a Lennox Gas Furnace. The Therm. has a 5 wire max. my furnace has 6 wires. I got the heat working vis trial & error. I did burn up the coil in the process. I can't do the same with AC until it gets warmer & then what about the 6th wire. The color codes don't seem to match. Now what? Any ideas. I'm trying to save money!!


01:39PM | 02/02/99

Is your unit truly gas, or a heat pump with a gas backup. Usually, 6 wires is an indication of one of three possibilities; a heat pump, multistage, or you have extra set of wires for the clock. Based on the fact that you have no matching wire colors, I would say you do not have a compatible thermostat: If you have a pure gas furnace, then it is a multistage, and although you have the heat working, only one stage is probably operational. Of course, this is all speculation, but I strongly believe the thermostat you purchased will not function properly in the long run. You fried the transformer already, with a/c you might toast the circuit board, a much more costly item.

I just installed the same thermostat type, albeit a Honeywell make. The instruction booklet confirmed what I just wrote, that the 5-wire unit cannot operate a 6-wire heat-a/c system. In your instruction booklet there should be a 1-800 number to check compatibility. If not, return yours, and call Honeywell at 1-800-468-1502, and they can give you the right model number. I had a variation on my system, which warranted a call, and they were very helpful. Sears also sells Honeywell thermostats, and besides, Honeywell probably made your Sears version in the first place.

Good luck.



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

Rather than sitting concealed behind closed doors, this closet rod hangs out in the open like a ballet barre. Clothes face... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... 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... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... 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