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Old 10-08-2013, 12:32 PM   #1
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Concord 80 Plus furnace issues


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.

New filter is in BTW.


Thanks

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Old 10-08-2013, 07:49 PM   #2
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Concord 80 Plus furnace issues


Quote:
Originally Posted by Angry Snail View Post
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.

New filter is in BTW.


Thanks
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

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Old 10-08-2013, 07:59 PM   #3
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Concord 80 Plus furnace issues


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.
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Old 10-08-2013, 08:06 PM   #4
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Concord 80 Plus furnace issues


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).
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Old 10-08-2013, 08:09 PM   #5
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Concord 80 Plus furnace issues


Thank you for the help - is the furnace control the unit that contains the blinking light?

I'm sorry, you are dealing with a complete idiot when it comes to these things, i'm not sure what a furnace control is.

Do not worry, I am "handy", I just do not know the terminology.
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Old 10-09-2013, 04:21 AM   #6
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Concord 80 Plus furnace issues


Yes, the board with the blinking light is the furnace control board.

Sorry, but I got called out shortly after I posted earlier, and by the time I gone done and back home. I was ready for bed.
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Old 10-09-2013, 06:34 AM   #7
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Concord 80 Plus furnace issues


Quote:
Originally Posted by Angry Snail View Post
............
The lower part of the furnace I just noticed (i'm guessing that's a fan down there?) hums ever so quietly...........
Idle fans shouldn't ought to hum. Maybe that is the transformer you are hearing?
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Old 10-09-2013, 06:43 PM   #8
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Concord 80 Plus furnace issues


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
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Old 10-15-2013, 05:23 PM   #9
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Concord 80 Plus furnace issues


Thanks guys, here's what i've done so far.

Replaced batteries in thermostat = no change
Jumped wires @ thermo stat = no change

With wires jumped at thermostat:

Checked voltage on board between R & W = 0 volts

Unplugged inducer motor and checked voltage at harness to board = 0 volts

Checked voltage between R & C on board = 27 volts

Everything checked with wires jumped at thermostat and panel door switch held shut.

Anything else to check? Any ideas? There is no "manual" lighting of the pilot on this thing that I can see.

Filter replaced and squirrel cage moves freely.
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Old 10-15-2013, 05:24 PM   #10
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Concord 80 Plus furnace issues


Should I jumper R & W at thermostat or actual furnace board?

I have the red and white wires coming out of the wall twisted together right now.
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Old 10-15-2013, 05:28 PM   #11
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Should I jumper R & W at thermostat or actual furnace board?

I have the red and white wires coming out of the wall twisted together right now.
take those wires loose at the board ...and jump r to w ..see if unit starts...ben sr
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Old 10-15-2013, 05:35 PM   #12
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Concord 80 Plus furnace issues


Thanks ben, heading down there to do this right now.
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Old 10-15-2013, 05:39 PM   #13
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Concord 80 Plus furnace issues


Placed jumper wire between R & W on furnace circuit board, turned furnace on and held the door switch closed = nothing happened
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Old 10-15-2013, 05:43 PM   #14
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Concord 80 Plus furnace issues


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Placed jumper wire between R & W on furnace circuit board, turned furnace on and held the door switch closed = nothing happened
is there a 24 volt fuse on control board 3-5 amp ...have to leave on a call will be back around 9-930 ...pics would help.. ben sr
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Old 10-15-2013, 05:45 PM   #15
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Concord 80 Plus furnace issues


make sure power is on and door switch closed ...measure voltage between r - and c ...ben sr

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