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Old 10-22-2013, 01:01 PM   #16
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Lennox G61MP won't stay burning


Is it actually lighting up with a blue flame like you said in post #1 and then stopping?

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Old 10-22-2013, 01:10 PM   #17
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Lennox G61MP won't stay burning


Vents seem clear, guards in place
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Old 10-22-2013, 01:12 PM   #18
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Lennox G61MP won't stay burning


Yes lights blue for a good couple minutes
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Old 10-22-2013, 01:16 PM   #19
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Lennox G61MP won't stay burning


If it runs for a couple minutes then it HAS to actually trip/pop one of those rollouts in order to get the code or you got a weak fluttering connection somewhere, I suspect one of those molex plug connections as I have had several problems with them or you got a bad board. I have sold thosuands of them and not had that problem (yet). Logic says the problem got created at the board when it was touched so more than likely it is there. Did you actually physically remove that connector and do what I told you? Have to do that exactly as I have had to do that several times with them.
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Old 10-22-2013, 01:51 PM   #20
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Lennox G61MP won't stay burning


Yes pulled the plug, all wires looked like they were making good contact. plugged back in, went through wire by wire with a needle nose and gave a little pressure.

Thanks again for the help all.
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Old 10-22-2013, 01:53 PM   #21
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Lennox G61MP won't stay burning


If it is not an issue with the molex plugs as Yuri suggests, I would make sure that the condensate drains are not clogged up. This, too, will also cause your furnace to shut off after a couple of minutes. You can use a shop vac to suck all of the gunk out of the drain lines. It might take several times before it is completely clear.
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Old 10-22-2013, 02:34 PM   #22
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Lennox G61MP won't stay burning


Line also seemed clear.. minimal amount of water.
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Old 10-22-2013, 03:01 PM   #23
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Lennox G61MP won't stay burning


Put in a call to the board installers
They'll be on their way...
Again thank you all, I'll post a solution or questions as they come up.
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Old 10-22-2013, 05:38 PM   #24
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Lennox G61MP won't stay burning


Tech came, checked all things posted here plus cleaned flame sensor. power cycled, same issue, same code.
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Old 10-22-2013, 06:48 PM   #25
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Lennox G61MP won't stay burning


Now is where the REAL techs get separated from the boys. You or your tech need to follow the wire circuit from the rollout switches back to the board. On that molex plug there is numbers from 1-12. one of them is the actual circuit from the rollout switches. there is corresponding numbers on the wiring schematic show the jack plug ( molex plug) corresponding circuit. Using the manual firedog provided I am very sure that the switch is called S47 and the wire from that circuit goes in that plug at number 12. All depends on your actual furnace diagram and series and date of manufacture so it is best to get it off the diagram. 99% chance that I am right as Lennox does not change info very often there. depends on whether it is a Honeywell board or the White Rodgers one also. basically you find that number 12 wire and put a volt meter between there and C common on the thermostat wiring terminal or a green ground wire and fire it up. if the switches are actually opening then you lose the 24 volts and that is proper, if it drops out for no reason and 24 volts is there then the board is bad. pretty advanced stuff eh!

the wires are also colored and you/he can physically pull and trace them from the rollouts down to the board to make sure.

not sure if I can walk you thru that any deeper as the top techs know how to do it and it is pretty advanced. try get another tech from them or talk to the service manager.
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Old 10-23-2013, 08:27 AM   #26
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Lennox G61MP won't stay burning


If you look at the wiring diagram Figure 54 on page 41 it shows that the primary limit, secondary limits and roll out switches are all in series in the same circuit. You can test the entire circuit of high temperature/flame rollout limits on plug P58 on the control board at terminals 6 and 11 of the 12 conductor plug. That circuit should read closed (near zero ohms). If it reads open either one of your rollout switches is tripped, one of your limits is bad, or there is a break in a wire or terminal in one of the molex plugs in the limit circuit.
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Old 10-23-2013, 12:38 PM   #27
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Lennox G61MP won't stay burning


And the answer is: Tech installed board wiring incorrectly. The gentleman here today says the diagram sent with the replacement board was wrong. I do know 3 different diagrams came with for different versions of furnaces, but this makes the last posts from FireDawg and Yuri make a lot more sense to me now. Prior neither rollout was wired in circuit with either of the pressure sensors, which at a glance are now...

Again THANK YOU ALL SO VERY MUCH, love that this forum came to a correct answer (essentially) remotely with little to no visuals, before the technician on hand. I am extremely impressed!
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Old 10-23-2013, 12:48 PM   #28
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Lennox G61MP won't stay burning


Glad to hear you got it up and running. Thanks for letting us know the outcome.
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Old 10-23-2013, 03:12 PM   #29
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Lennox G61MP won't stay burning


Glad it is working. Out of curiosity did they use a genuine Lennox board which came in a Lennox box with a Lennox part # on it?

There is a universal board made by White Rodgers which can be used and actually WR made 50% of the boards for them anyway. The universal is a bit trickier to install.

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