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tytek · Mar 9, 2014, 12:14 PM

I have a 2yr old coleman furnace that is 96% efficiency gas furnace.

My furnace does not have central air.

My installer never finished the job, has heat vents connected but no cold air returns ran. It is horizontal mounted with the bottom removed so it pulls in basement air.

It has worked OK for the last few years, had to have someone repair an electrical problem where one of the 2 wires from the junction box had broke? And he said I only had 1/2 of 110 running into the furnace. The other problem involved a bird that got in my basement and got sucked into the blower cage.. I slid the cage assembly out and extracted the bird.. the cage has always sounded a little out of balanced since then.

My current problem started with us waking up in the morning to a 56 degree house 4 days ago. I checked the furnace and it was blinking 4 red lights and the burner assembly was making a blowing sound with no burners going. I opened the blower compartment and closed it and the system fired up like normal. It ran, brought the house up to temp and maintained it for 12 hours and did the same thing. I figured it was the blower motor and/or cap and ordered both. For the next few days it continued to work awhile and then code with 4 red on shorter and shorted intervals. Twice the fan decided not to start and smoke came from it.. but after resetting the system and letting it cool down it starts up.. It is starting to rattle a little and the cage bangs some when starting and finishing.

Still haven't got my motor or cap.. supposed to be wed before they arrive. Now it has started coding other errors.. first it did 8 red blinking then 7 red blinking.. one is too many retries and the other is too many restarts.. both it worked after opening and closing the blower door to reset. Then I got 5 red blinking meaning that the condensate switch had tripped.. so I blew out the vacuum and water lines and checked the drain for blockage and it would restart but only run about 2 hours..

Now I am getting 9 red blinking lights which is a ground or neutral line fault. Reminds me of a year ago when I had the electric fixed. I noticed an arching between the metallic tape and chassis where the plenum is attached. Now it goes through a full ignition cycle, but the flames all cut off just when the blower starts and it keeps going blowing cold air and of course the red code 9 starts blinking..

I just used my multimeter and verified that the common and neutral are 125v. Not sure where the ground is. Maybe I should run a ground to the chassis. Not sure about the arching from the aluminum foil to the chassis.. checked and it read about 7v.

Ps, can't wait for spring :)

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