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Old 10-28-2010, 11:58 AM   #16
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Carrier 58PAV070-12 with error code 31


kenmac, are you referring to the white wire connecting to the hot surface ignitor? I just uploaded a diagram of my furnace model. Can you please point out to me which white wire I'm supposed to check for 24V? Another question about checking the limit, this might sound dumb, how do I check the limit, using voltmeter to check the voltage or just physically see if any damage? I really appreciate all of you guys help here.

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Old 10-28-2010, 02:17 PM   #17
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Carrier 58PAV070-12 with error code 31


Quote:
Originally Posted by peterzhang
kenmac, are you referring to the white wire connecting to the hot surface ignitor? I just uploaded a diagram of my furnace model. Can you please point out to me which white wire I'm supposed to check for 24V? Another question about checking the limit, this might sound dumb, how do I check the limit, using voltmeter to check the voltage or just physically see if any damage? I really appreciate all of you guys help here.
You can measure the resistance (ohms) across the limit switch terminals. You should get less than 1 ohms. You may want to hook everything back up and cycle your unit. Pressure switch sounds suspect. Put your meter leads on the terminals (with the wires disconnected) and you should show OL with no call for heat, inducer motor off. Upon call for heat, with inducer running, you should read less than 1 ohms resistance.

Last edited by The O; 10-28-2010 at 02:34 PM.
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Old 10-28-2010, 02:35 PM   #18
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Carrier 58PAV070-12 with error code 31


He said he by passed the ps & it still wouldn'r start up. That should eliminate the ps. I'm talking about the white wire at the control board. On call for heat the w is powered from the t.stat.. At the limits just check for 24v
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Old 10-28-2010, 03:04 PM   #19
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Carrier 58PAV070-12 with error code 31


Quote:
Originally Posted by kenmac
He said he by passed the ps & it still wouldn'r start up. That should eliminate the ps. I'm talking about the white wire at the control board. On call for heat the w is powered from the t.stat.. At the limits just check for 24v
If he bypassed the pressure switch while it was operating for some time it was probably already in alarm. If he bypassed it before the inducer energized then it would of also went in alarm. The"white" wire is getting energized or else the inducer motor would not initiate it's cycle

Last edited by The O; 10-28-2010 at 03:14 PM.
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Old 10-28-2010, 04:18 PM   #20
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Carrier 58PAV070-12 with error code 31


Here are steps I did when I bypassed the pressure switch
1) shut the power off
2) removed the two wires connected to pressure switch
3) used a safety pin and jumpered two wires together
4) turn the power back on
5) I got error code 12 initially, 90 seconds later, inducer motor was on, error code became 31, hot surface ignitor was cold, I didn't leave the furnace on for very long, I just turned it off immediately.

I'll measure that white wire as knmac suggested to see what I get tonight. I'm also planning to take off some parts, i.e. pressure switch, ignitor and put them in my neighbor's furnace to see if they are working or not. All of our houses were built by the same builder at same time, so all our furnaces are same. I hope I can figure it out soon before temperature gets too cold.

So you guys don't think the board is the problem in my case? Thanks much for all the replies. Let me know if you guys think of something else I shall check.

Last edited by peterzhang; 10-28-2010 at 04:21 PM.
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Old 10-28-2010, 04:39 PM   #21
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Carrier 58PAV070-12 with error code 31


When you bypass your switch before the inducer is coming on your board will go into alarm. The right way to test it is to disconnect your wires and 5 seconds into inducer operation, jump the wires together. THEN your ignitor will glow and burner will fire up. It is very important that these switches don't get jumped out but only for troubleshooting. This is why it won't operate by someone leaving jumpers on it. The board is smart, needs to read an open switch with inducer off then read close when it is supposed to be on

Last edited by The O; 10-28-2010 at 04:43 PM.
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Old 10-28-2010, 08:06 PM   #22
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Carrier 58PAV070-12 with error code 31


guys, thank you so so much for all your helps here. My furnace is working now. I noticed the high limit switch got triggered, I reset it, and tried again, it's working now. so what could cause the limit switch trigger? wind? Thanks,

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