Lennox G12Qe series 1986... furnace lights and if I wire blower up to constant power will work.. but blows luke warm air out...

Any ideas... blower will not come on unless I hook up constant to it..

Clean your sensor or your pilot is plugged

clean your sensor or your pilot is plugged

Ok but furnace is working, I mean nice blue flames... problem is heat is going out exhaust.. really warm on flue.. but not on vents into home..

Any ideas...

Have you checked your filter if you set the thermostat to fan on do you feel warm air blowing

have you checked your filter if you set the thermostat to fan on do you feel warm air blowing


Well filter is removed right now, due to wiring it up...

Would it matter that I replaced the furnace janitrol(downlfow) with an upflow furnace?

Yes the duct system is set backwards and that's not at all recommended

yes the duct system is set backwards and thats not at all recomended


So how can I fix problem..

I can't afford a new furnace... and need heat bad..

There's not a cheap way to fix it either get all new duct work or a different furnace sorry

theres not a cheap way to fix it either get all new duct work or a different furnace sorry


Ok I don't think the old janitrol was a down flow.. I mean the cold air was just like the lennox,except the filter was outsie the housing on the bottom right, the plenum was on top, with 6 inch duct for chimney in fron... so I am assuming it was upflow also... blower is on bottom..

So now what do I check for...

Thanks for your help

Do you have the duct work sealed tight or is air blowing out all a round

do you have the duct work sealed tight or is air blowing out all a round

Not completely sealed..

My return is open on end to basement.. wife said and people at work said suck the air out of basemnt.. I knew better but did what they said.. could this be problem with not hot air?

What about the blowerr.. I don't want it on all the time...

If you set to auto does the blower came on at all or does it run and shut off

if you set to auto does the blower came on at all or does it run and shut off

Doesn't come on at all.. have waited for over 3-4minutes and nothing... I am thinking cause furnace is not warm enough yet? For it to kick on.. or should it..?

You will get what's call gravity heat because of the basement return air put a filter in if you can that will help a little

do you have the duct work sealed tight or is air blowing out all a round


Not sealled off and cold air intake sucking air out of basement..

OK on Filter... now what about blower, how can I get it to shutoff by itself... or is not kicking on because of the cold air?

You have been a real help by the way.. ;>)

Take the top door off in the middle of your furnace is a fan switch it might be covered by a silver box or you might have what's called a camstat where you will be able to see the temp settings let me know which one you have

take the top door off in the middle of your furnace is a fan switch it might be covered by a silver box or you might have whats called a camstat where you will be able to see the temp settings let me know which one you have


I have camstat.. it set between 100-105..

OK does the blower come on and only run for about 30 seconds or is it not coming on at all now

ok does the blower come on and only run for about 30 seconds or is it not coming on at all now

Only comes on if I wire it hard...

It sounds like the camstat might be bad or the low speed on the blower windings are out you could try switching speeds the red wire is low yellow is medium and black is high try a different speed if that works then low speed is out if not replace the camstat

it sounds like the camstat might be bad or the low speed on the blower windings are out you could try switching speeds the red wire is low yellow is medium and black is high try a different speed if that works then low speed is out if not replace the camstat

Ok so which wire do I wire the yellow into..

The black wire coming down from the camstat the black wire that was hooked up to the red that went to the blower

Disconnect the red put tape over the end of the red wire hook up the yellow then

disconnect the red put tape over the end of the red wire hook up the yellow then

Ok two camstat wires coming down from top.. both black...

One is hooked into middle of relay.. the other is hooked to power source..

Thre was not any other wires hooked to the blower.. just the white to the neutral..

So where to hook up the yellow? where the white was hooked? Probably not is what my gut tells me, but?

Where was the red wire hook to did the red go to the relay ?is there a diagram you can read there should be one black wire that goes to the power source then to the relay from the normal close contact to the camstat then back to the red wire on the blower

where was the red wire hook to did the red go to the relay ?is there a diagram you can read there should be one black wire that goes to the power source then to the relay from the normal close contact to the camstat then back to the red wire on the blower

Red wire was capped off when I got it from the guy.. so should I hook the red to fan relay(black wire that is not hooked up).. keep the white hooked to neutral..

All of the wires from camstat go directly back to relay.. but don't hook to anything else..

Leave the white to neutral hook to the red to wire on the relay the one coming back from the camstat

leave the white to neutral hook to the red to wire on the relay the one coming back from the camstat

OK.. I thoght that was it, but wanted to make sure before... I fryed somethi8ng.. :eek:

Anything I should do, what about yellow wire for cooling.. I don't have ac on this furnce hooked up..

Thanks again

The black wire is for cooling and that hooks up to the relay I think on terminal # 3 I hope everything is working and your welcome

the black wire is for cooling and that hooks up to the relay I think on terminal # 3 I hope everything is working and your welcome


Ok hooked everything up, blower kicked on right away.. no hot air though out pipes! GRRR..

It is very warm on outlet flue? Should that be hotter?

It should be about 130 degrees and it should shut off at 105 there is a heater usually on a camstat to kick it on more quick if you hook up the duct work so you don't take air out of the basement it will be a lot warmer

it should be about 130 degrees and it should shut off at 105 there is a heater usually on a camstat to kick it on quicker if you hook up the duct work so you don't take air out of the basement it will be a lot warmer

I got it set to 115 degrees , it will go to 120.. I can set it there.. working on cutting cold air to hook back up...

So I got this thing wired right you think?

I think so

i think so

Well thanks for all your help, found out why the fan wouldn't kick on unless hard wired, I had a wire coming from cam stat that I hooked into fan spped red wire, works good now... just doesn't blow out hot air yet.. we'll give it couple of days and see if we can warm up air in house...

My Family and I wish you a Happy Thanksgiving!

:D :)