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LENNOX MODEL:G26Q3-75-1 S/N 5894L37210 Furnace will start and run for a few minutes and then the gas valve turns off. The burner will cycle on and off without staying on to complete a full heating cy

The thermostat, flame sensor, pressure switch, high temp switch, and inducer blower (blower runs and drains properly) have all been checked and are in working order. The problem got progressively worse and now the furnace will not light. The gas valve was clicking and buzzes at times while it was cycling. But as the problem got progressively worse the gas valve will not even turn on the pilot light when the igniter starts. There is a very faint smell of gas but nothing overpowering. Had the furnace for around 20 year and never smelt gas at the furnace before. I suspect the gas valve is faulty. Any ideas? m experts

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koolbreezes
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SOURCE: Yokr gas furnace will not start up

You could have the gas co to check to preassures at or before the unit. Too low or high a preassure and the gas valve cant regulate the proper flow>>Natural gas to the house needs at least 5"-wc psi ---to the gas valve needs 7.5"--wc and while its calling for heat the orrifice needs 3.5" -wc psi! Propane needs 11" wc psi to the valve on the unit and 11' -wc psi to the inside furnace.

Posted on Dec 21, 2009

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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: Janitrol GUPS075-3 Furnace burners will not stay lit

The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

Posted on Nov 08, 2012

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? 2:44
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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 ...

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