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My burners won't light

Post created: 2013-04-25 Type of Equipment: Furnace Views: 1045

This question was created on the page: https://www.furnacecompare.com/furnaces/lennox/elite.html.

On 2013-04-30 JB wrote:

The first question is to ask if there is power coming to the furnace and whether the blower turns on, but the burners simply won't light. There is also the question of whether gas is getting to the furnace.

So with these questions in mind there are a few things that could be up. If the furnace is getting power but simply not starting up it could be the thermostat that has gone bad to the furnace just isn't getting the call to fire up. If the blower is coming on, but the burners won't light it could be that the valve that opens to allow the gas through is either stuck or being prevented from opening by a safety feature. This could be due to improper air flow through the heat exchanger, which can be caused by a dirty filter, blocked duct and so on.

You may also have a bad igniter. Furnaces no longer have pilot lights. Instead, they have an igniter that looks like a probe that heats up when electricity is passed through it to ignite the gas.

You could also have clogged burner jets. The solid remnants of combustion can cause this.

Probably the first place to start is to look and see if you are getting an error code. This should be either a couple of lights or an LED display near the main board on the furnace. You can read the code and determine what it means in your owner manual. Sometimes there is a list of these codes on the inside of the cover panel.

Of course, if you don't have experience working with furnaces doing more than checking the error codes can be very dangerous and/or make things worse.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.

On 2013-12-24 Matt wrote:

I have a Lennox Elite g61 mp series furnace. It runs fine 100% functional on standard consumers energy company power. The last two times I lost power due to ice storms, the furnace was very difficult to get lighted while running on generator power. The exhaust blower runs for about 30 -50 seconds, the ignighter is just starting to glow and then it turned off. I get a double alternating green rapid flash error code which indicates the power is not stable or isnighter is malfunctiontioning. . After about 5- 10 attempts to get the furnace to light with a 2- 5 minute delay between lighting Attempts the furnace will eventually light up and work for one heat cycle. Usually the next heat cycle will fail to light again when running on external standby generator power.

From what I have read the stock igniter control board on the Lennox furnaces are a little fussy about running on generator power. Is there a different control board that I can swap for the Lennox Surelight two stage 4502 rev igniter board that is not so fussy about running on generator power?

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