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Old 03-13-2014, 05:55 PM   #46
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My Furnace Lennox G51MP is not staying ON


I own a lennox G51MP and is nor working properly, I Called a company to see what was wrong and they said that is the Control board or the surface ignitor.
Whe I turn on the furnace, the furnace works and it reaches the temperature that I have set on my Thermostat but when it calls again for heat the induction motor stays on and it does not shut off and it gets very hot as well.
I would like to know if soembody has an Idea on what's wrong with this furnace the comoany that I called wants $1,300. to fix my furnace this is alot of money this furnace is only 7 years old, I know that is something simpler that what they are talking about also the person that came to see the furnace told that it could be the pressure switch this furnace has two.
Hopefully somebody will answer my queistion and concerns

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Old 03-13-2014, 05:56 PM   #47
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I own a lennox G51MP and is nor working properly, I Called a company to see what was wrong and they said that is the Control board or the surface ignitor.
Whe I turn on the furnace, the furnace works and it reaches the temperature that I have set on my Thermostat but when it calls again for heat the induction motor stays on and it does not shut off and it gets very hot as well.
I would like to know if soembody has an Idea on what's wrong with this furnace the comoany that I called wants $1,300. to fix my furnace this is alot of money this furnace is only 7 years old, I know that is something simpler that what they are talking about also the person that came to see the furnace told that it could be the pressure switch this furnace has two.
Hopefully somebody will answer my queistion and concerns
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Old 03-14-2014, 08:00 AM   #48
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Is it the induction motor that won't shut off and gets hot. If so the the relay on the control board is sticking on and you need a new board. It is easy to change and you can get it from cozyparts.com.
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Old 01-02-2015, 05:37 PM   #49
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The Red Tube!!


Just wanted to say thank you for this thread.. Spent a couple days troubleshooting my issue of the burners going on and off. I cleaned the soot off the sensor rod, checked ventilation blocks, but cleaning the pressure switch tubes worked like a charm. There was a lot of build up in there! Was on my way to hiring someone to come out! Thanks again
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Old 01-02-2015, 08:30 PM   #50
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Yur Welcome
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Old 02-05-2015, 07:59 AM   #51
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Thanks, Yuri


Thanks, Yuri. I cleaned the flame sensor and now we have heat! You are still helping people 7 years after your original post!
Kansas City, 2/5/15, 4 degrees.
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Old 02-05-2015, 08:18 AM   #52
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It's an Oldie but a Goodie
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Old 01-02-2016, 03:36 PM   #53
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furnace did not stay on


the information received did work by cleaning the furnace flame sensor:smile
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Old 01-02-2016, 06:25 PM   #54
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Had the same issue as the original poster a few days ago and found this thread. Furnace is back running once again. Thank you Yuri for sharing your knowledge and saving us DIY'ers from the cold.
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Old 01-02-2016, 09:38 PM   #55
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Glad 2 help.
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Old 03-06-2017, 09:31 PM   #56
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Re: Lennox Furnace burner won't stay on


Need To revive this Thread, have a Lennox G43UF furnace that going crazy.

A week ago the furnace started to act up, it would take 3 tries to start until it stopped working with the green LED on and the Red, after looking further found the inducer gone, replaced the inducer and the furnace worked for 2 days and it started to act up again as follows:-
First try:-
1 - Water into humidifier
2 - Inducer fan on
Stops

Second Try
1 - Water into humidifier
2 - Inducer fan on
3 - Ignition start
4 - Flames on for 1 sec
Stops

Third try it works and as it works it give error code about flame sensor for 1 sec, then normal operations and shuts down after 5-6 minutes.

Today I replaced the flame sensor and it is still doing tricks as follows:-

First try:-
1 - Water into humidifier
2 - Inducer fan on
Stops

Second Try
1 - Water into humidifier
2 - Inducer fan on
3 - Ignition start
4 - Flames on for 1 sec
Stops

Third Try stops and error code Green Light on and Red Off complaining about pressure switch after a while the lights go back to normal and then it make the same sequence but it actually works for extended period now 15 minutes or more and then quits with just the green light one and Red off and so on and son forth.

Please help
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Old 03-07-2017, 07:10 AM   #57
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Re: Lennox Furnace burner won't stay on


Is it giving you a pressure switch fault code? If so check your vent pipes outside for obstructions.

Where did you buy the inducer. e-bay?

Was it in a sealed box? Lots of e-bay stuff may be used. If it is not turning fast enough or a OEM Lennox unit it may not be producing enough draft to close the pressure switch. That should be checked with a manometer.

cozyparts.com for Lennox parts.
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Last edited by yuri; 03-07-2017 at 07:13 AM.
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Old 03-07-2017, 09:33 AM   #58
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Re: Lennox Furnace burner won't stay on


I am in Canada, and I got it from an HVAC supply store, it is of the same manufacturer as the original "FASCO" and I double checked the part number from multiple sources.

As for the vents I checked as much as I can and they seem to be clear, as when I was replacing the inducer I can feel the cold air draft coming through the vents.
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Old 03-07-2017, 12:16 PM   #59
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Re: Lennox Furnace burner won't stay on


Take the hose off the pressure switch and poke the hole thru where it attaches to the plastic collector box on the furnace with a nail or small drill bit.

If it still acts up then you need a Pro to check the vacuum on that port with a manometer and compare it to what the switch is rated for. Or buy yer own manometer.
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Old 03-07-2017, 01:20 PM   #60
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Re: Lennox Furnace burner won't stay on


I already took the red hose and run air through it and it is not blocked should I do the same with the black hose as well

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