Hi all, glad I found this site as there seems to be quite a few DIY pro's here.
I have a Concord 80 plus furnace that is not working, and by that I mean it isn't doing ANYTHING. No clicks, beeps, etc.... except for a continuously blinking green light.
I have messed with the thermostat, turned it down, off, replaced the batteries, etc.....Flipped the switch on the side of the furnace, reset the breaker.
I would think, and I don't know if this is right, that the furnace should make some noise when it attempts to start - I get nothing. I've had my wife fuss with the thermostat while I sit down there staring blankly at the internals of a furnace and nothing happens at all. I am pretty sure after researching that it has some sort of auto pilot light (there's no pilot light anywhere to be found), but nothing glows or ??? is supposed to happen. This thing is dead in the water except for that blinking green light. It doesn't appear to be a fault code of any sort because it blinks continuously and never stops. I work on cars and computers, i'm able to read and understand fault codes - unless a non stop blink is code for something i'm lost.
Any ideas? I'm going to take the flame sensor thingamabob out and clean it but I don't know how that will help as it currently never sees flame to begin with.
you need to see how many times it blinks for the fault code......power down the service switch and turn it back on and observe furnace it should restart...ben sr
Thank you for the response Ben, I have powered the furnace down several times, the fault code light blinks constantly - it does not stop at a "count". Meaning, I could count the blinks infinitely if I sat there. Dim, bright, dim, bright, dim, bright ~
The lower part of the furnace I just noticed (i'm guessing that's a fan down there?) hums ever so quietly.
Hope that helps, sorry for the vague details but that's all I have to go on right now.
With the power turned off, run a jumper from the R terminal to the W terminal on the furnace control. Then turn power back on and see if it runs(with the panel back on).
I believe that has a honeywell smartvalve in it ....which is what you are seeing blinking...or as you say bright dim,bright dim..which is normal ..do as been said in lower compartment jumper r to w then hold in door switch see if it starts....if it does problems in thermostat or it wiring...ben sr
Very dirty and dusty, first time i've ever opened this furnace so i'm going to blow the board off, clean it up a bit and i'll look at it, take pics, etc.....
Ben I really appreciate the help and knowledge that you're giving me. Working on race cars and computers my entire life I can appreciate someones help!
Use meter and see if you read 24 volts or more from the R terminal to the W terminal on that board with the safety switch closed. If so, then run a jumper wire from the R terminal to the W terminal, and close the door safety switch again, and see if it runs.
First thing I notice is that you don't have any wires from the thermostat connected to your board. Did you remove them for cleaning or there aren't any wires attached? There should be thermostat wires attached in the circled area on the board.
Just went down and checked the Honeywell valve, seems it controls the inducer fan. There's a 4 pin plug that gets power from the control board, those 2 wires are getting 118 volts to it. The other 2 wires in that plug assembly go to the wiring harness for the inducer, there's 0 volts in those 2 wires. Is there something inside the valve that tells the inducer motor to turn on?
sorry i see the top of the valve ...is the switch on...don't laugh I worked on one a few yrs back for about 45 min ..only to find the switch on the valve off...ben sr
I work on computers as a 20 year IT tech, the stuff i've seen..........
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