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Lennox g26q3 We have a G26Q3-75-5 Lennox Furnace that isn't working properly. I have replaced the fasco 7021-9450 induction motor/fan. The induction motor starts up but shuts of before the blower will start and the gas will ignite. Any Ideas?

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  • 56 Answers

Electronic ignition or pilot type? assuming electronic ignition, check the airflow sensor for dirt in the peto tube, or a defective sensor, if you hear the high voltage click but have a failed ignition chec that the pilot is being lit, and that the thermopile/infrared sensor is good. one of those is your problem.

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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SOURCE: I have a lennox G26Q3-75-2 furnace it ignites you

Hello, most likely the capacitor has failed and needs to be replaced. the capacitor is a small oval or round can with either two or three prongs on it. When a capacitor goes bad the motor has trouble starting.

Posted on Feb 23, 2011

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SOURCE: My 1985 Lennox furnace would start, shut off and did that several times. Now won't even start. Any ideas?

Did the burners light and then shut down right away?

Posted on Dec 20, 2012

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What is the model number? I have an SLP98 (installed on 11/29/2011).... and if I take the cover off the front of the furnace the panel that has the fancy "Lennox" badge on it) you will see two clear round windows about the size of a half dollar (one high on the furnace box and one lower on the blower box.) If you look downward into the window on the blower box you can see a red LED display that will sometimes flash error codes like E228 (one character at a time). If your model has something like this, let me know. I've done some DIY fixes recently out of necessity....and their easy.....and several technicians confessed they didn't know much, if anything, about the newer high effieciency Lennox gas furnaces.

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Troubleshoot an ignition problem on a Lennox gas furnace ...

? 2:44
https://www.youtube.com/watch?v=yXIxgzwMkPs
Nov 17, 2012 - Uploaded by grayfurnaceman
This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...

Lennox Furnace Model G11Q3-82-2 - RepairClinic.com



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I have a lennox G26Q3-75-2 furnace it ignites you can hear the pressure switch click to engage blower motor, but blower motor will not turn, its not froze up


Hello, most likely the capacitor has failed and needs to be replaced. the capacitor is a small oval or round can with either two or three prongs on it. When a capacitor goes bad the motor has trouble starting.

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Lennox Fan will not come on when set to ''auto'' position.


Expensive is relative, service calls are never free. But if you have an idea what the problem is, you are armed against an unethical service company. Now to what you describe, could be a couple things, first let me explain the difference in fan speeds. Furnaces that both heat and cool have multi-speed blower motors. High speed is for cooling and lower speeds are for heating. The fan switch at the T-Stat turns on the high speed fan relay. The lower speed fan is turned on by either a temperature activated switch (silver box mounted on front on furnace above burners) or a time delay relay which is solid state. That being said, your problem could be a defective fan switch or one of your blower motor windings has gone bad. Most motors have 3 or 4 speeds and a technician could just change speeds and all would be good. A fan/limit switch is not so expensive that you would replace the unit. Bottom line, unless your really handy, a heating company is in your future. Good luck and please rate my answer if it was helpful to you.  

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Itseems as though the condensation trap on Lennox G26 not working


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Take of both access covers on your furnace. In the bottom compartment (where the indoor blower fan is) there is a condensate trap, It will be black, gray, or white. Disconnect the rubber tubing that is connected to it (these tubes run up to the collector box in the top compartment. Remove the condensate trap and wash it out until it is clean inside. You will have to shake it some to get all the dirt out of it. Reinstall it and you should be good to go. Hope I was of help to you!! Good Luck!!

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1 Answer

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sounds like the ignitor is bad. there shoule be a 2 wire plug going to it. after the inducer motor starts, you can check the voltage at the 2 wire plug located under the burners. you can unpug it to check voltage or you can probe the back side of the plug with a volt meter. if you are getting 120v but it is not glowing, it is bad. you can also ohm it out while it is off.

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