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Bad igniter? When you 1st try it the gas valve will give enough gas that you would get the burner lit if the igniter was glowing red. If you're desperate you can light the igniter area w/ an aim n flame, but you definitely want to do that w/ caution and crank up your t-stat so the furnace stays on awhile Cuz you'll have to do it again for heat or buy an igniter($40 or so)
power to gas valve ok .. Replace gas valve after checking gas valve coil for continuity/resistance... with valve removed ...and power to valve ... try blowing thru valve from supply side ... stuck valve.... replace...
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 ...
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.
Based on your model number this furnace does not have a pilot light,instead it uses a hot surface igniter.typically it glows and when it gets hot enough the gas valve will open and the burners will light.When the igniter starts to go bad it will glow but not get hot enough to open the gas valve.If your furnace lights and the quickly goes out the flame sensor maybe dirty.
The electronic ignition system in a gas furnace is a modern development that
allows more reliable performance than standing pilot furnaces, provides energy savings and contributes to better furnace efficiency (AFUE). With a standing pilot, found most commonly on older low
efficiency furnaces (55% to 65% AFUE is not uncommon), a small gas flame is
always burning and is known in the lexicon of American home repair as a "pilot
light". The problem with this type of "analog" ignition is that it wastes energy
by constantly burning gas and can sometimes be unreliable.
These issues have led to the development of electronic ignition
systems for mid to high efficiency furnaces that exceed the U.S. government's
established minimum AFUE rating of 78%. The electronic ignition occurs typically
in one of two ways:
Intermittent Pilot, or
Hot Surface Ignition
The intermittent pilot system uses an electronically controlled high
voltage electrical spark to ignite the gas pilot and then subsequently the main
burners, when the thermostat
calls for heat.
The hot surface ignition system uses an electronically controlled
resistance heating element not unlike a light bulb filament (and shown in the
photo above), to ignite the gas burner.
It is important to understand some of the other components of a modern
furnace that you will encounter depending on the type of high efficiency furnace
you have. Why? Because they can also come into play in repairing an electronic
ignition furnace when it won't run properly. Let's take a quick review of the
types of furnace designs and components found in high efficiency furnaces using
HI follow the thermocouple lead back to the gas valve undo the silver nut foloow the lead back to the pilot and undone the nut on thermocouple or it may just pull out , or the burner might have to come out to replace it , if you arenot sure on this then a local gas fitter will do this .