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Old 10-19-2013, 01:50 PM   #46
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Concord 80 Plus furnace issues


That's what i'm trying to figure out, what is bad. I don't have a ton of coin to just throw parts at this thing, would rather do a good job of diagnosing the issue and fix it than to just throw parts at it hoping something works.

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Old 10-19-2013, 01:56 PM   #47
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Concord 80 Plus furnace issues


Make sure all other molex plugs are in tight/properly. If it still won't send voltage to the inducer, its the valve. You can often see the damage on the board if you open up the valve.
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Old 10-19-2013, 01:59 PM   #48
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Concord 80 Plus furnace issues


Thanks, i'm reading the manual on the control board now. I probably should double check some readings just to be positive that i'm actually getting a call for heat. I'll have to read back thru this thread to figure out how to measure that, i've done so much checking that i've forgotten it already :p
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Old 10-19-2013, 02:21 PM   #49
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Concord 80 Plus furnace issues


Basically the tstat sends a signal to the fan timer board which energizes a relay in the gas valve to turn on the inducer which closes the pressure switch then tells the smartvalve to light the pilot. pilot proves and sends a signal to the fan timer board to start the timer and then turn on the fan. have not seen one lately to tell you more. there may be some troubleshooting info at that Honeywell link I gave you. not easy to troubleshoot as the board talks to the valve and is interlocked. that board may be cooked as all the dust causes it to overheat ( boards hate dust ) and from vibration from the fan. some of the resistors/diodes or whatever they are look brown and overheated 2 me. fortunately HWell abandoned that system.
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Old 10-19-2013, 04:24 PM   #50
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Concord 80 Plus furnace issues


you have to know for sure about checking for power at the proper points to be sure if it the fan timer board or the valve itself....there is enough information here for you to do that follow the chart on post 35...ben sr
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Old 10-19-2013, 05:26 PM   #51
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Concord 80 Plus furnace issues


Thanks guys, been busy with this thing. Tore it apart and cleaned the board just so it's easier to work with.

I'm using a troubleshooting guide from Honeywells site.

The big question I have involves dealing with electricity, I am not a fan of this stuff.

The guide wants me to measure voltage across terminals (24 vac between transformer secondary terminals) I know where they are, do they want me to probe them with the wires attached or unplug them and measure the actual terminal on the board?

They want the same check between Heat and Neutral terminals - all of them? Same thing, leave them plugged in or unplugged and check the terminal itself?

This troubleshooting guide and all your help has me really close I think.
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Old 10-19-2013, 06:36 PM   #52
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Concord 80 Plus furnace issues


Checked voltage from transformer - 27 volts

Voltage between Heat and Neutral ( I used an unused neutral and another one that was being used) = 0 Volts


Says to replace the St9160


I think i've exhausted the diagnostics, order a part and see if I did it right
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Old 10-24-2013, 12:19 PM   #53
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Concord 80 Plus furnace issues


Wanted to stop in and say thank you once again for everyone's help!

New control board came in yesterday, I got it installed and voila - HEAT!!!!



I could not have done this without the help from members of this community - it just started snowing here so you guys really came thru for us.
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Old 02-01-2014, 04:24 AM   #54
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Concord 80 Plus furnace issues


Hello experts,

I'm looking all over the web to purchase a flame sensor/spark ignition for a 1997 Concord HVAC unit. This part has three prongs. Two are for the ignitor and the other is the flame sensor, all in one.

Can someone please help me locate this ignitor....please. We're freezing.

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