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Checking my furnace's ignition

How do I check my furnace's ignition?

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Gas burners serve as the primary source of heat in a variety of home appliances: water heaters, gas dryers, and gas cooktops and ovens, and-of course-- furnaces and boilers. When the burner fails, most gas appliances are designed to stop working altogether to prevent a gas leak. As a rule, it's best to have gas burner problems fixed by your gas utility service person or a qualified heating technician, but there are a few steps you can take to avoid paying for a service call.

Posted on Jan 18, 2006


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Posted on Jan 02, 2017


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Arcoaire furnace ran out of propane and now wont ignite

Check along the gas supply line to the furnace and make sure there isn't a valve that is shut off. If you have a gas oven see if the ranges light and have gas. I'm assuming you've also turned on the gas supply at the furnace itself as well. Check that the furnace has electricity it won't be able to open the automatic valve let alone fire the igniter. My brand new furnace had a safety switch that went out 3 days after installation preventing it from lighting. You might contact Arcoaire about that.

Dec 23, 2013 | Ovens


Trouble shooting your gas Furnace

If you are having trouble with you gas furnace they are really not that complicated to figure out. Most of the newer gas furnaces within the last 10+ years have a flash code on the circuit board inside the furnace. The trouble codes are in flashes. For example: 1 flash means ignition problem, 2 flashes mean vent pressure switch, 3 flashes means control board problem and so on. The first thing to do would be to check for a sight glass or window in the blower door to see if there is a flash code. Then you can pull off the blower door to check to see what the code represents. The code chart is usually located on the inside of the blower door.
If there is no flash type board in the furnace it still pretty simple to trouble shoot. First thing is verify that you have power to your furnace. You can do this by checking voltage with a simple meter. Check for voltage at the door switch since this is usally where the power starts. If there is power there then check for voltage at the thermostate between the R terminal and C for common. If there is power there then you need to go back to the furnace and try to figure out where the power is stopping. With the power to the furnace off start to check the safety switches. With an ohm meter or a test light you can start checking for continuity across your safety switchs. Check the roll out switch that is located near the burners if thats okay, Check the high limit that is usually located up higher on the front of the furnace that has two wires going to it, if that is okay then check your pressure switches and these you will have to check with the inducer or vent motor running. Hope that this information is helpful and if you don't feel comfortable using an electrical tester be sure to call in a professional HVAC Tech. to look at it.

on Dec 20, 2009 | Heating & Cooling

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Lennox 80uhg3-75a-3 igniter sometimes doesn't light , left LED slow flash, right LED solid.

The ignitor can crack and cause this, also check and clean the flame sensor.

Nov 25, 2013 | Heating & Cooling

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I have an older Carrier furnace type 58ss. The main burner will not ignite. Operating look ~ thermostat set @ 78 deg, switch furnace on, inducer fan running, pilot light clicks and ignites, inducer still...

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 01, 2013 | Heating & Cooling

1 Answer


After replacing all that I would be checking the safety items. There are two to three depending upon model. These look like buttons with two wires one in one out most brands the wires are purple, using a volt ohm meter check for continuity they are normally closed contacts so should ring out like a dead short. These if open will not permit the furnace to start up. Newer furnaces will also have a sensor on the exhaust fan as well it will be normally open until the fan comes in then it closes and permits ignition. Good luck if this does not help you it may be time for the furnace technician.

Dec 13, 2010 | Honeywell Heating & Cooling

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No ignition on dayton gas furnace. how hard is it to install new gas valve on a dayton furnace

not hard but before replacing check pilot light and thermocouple for proper function and setting if pilot light not in right position thermocouple wont open gas valve if electronic ignition check for power and proper gap on igniter also check stat for proper function

Oct 31, 2009 | Dayton Gas Furnace Heater

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Coleman presidential II furnace blower on and off

Sounds like the flame sensor. But it could be the thermostat. Is the furnace standing pilot or electronic spark or hot surface ignition. I would start by checking thermostat. Turn power off to furnace take thermostat off wall and take wires marked r & w and connect them together. Turn power back on if furnace works then change out thermostat.Most eclectronic ignition Furnaces have a flam sensor, You could take flame sensor out and clean it up with steel wool or wire brush. If you need anymore help just reply back .

Jan 17, 2009 | Coleman Propane Forced Air Heater...

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Furnace will turn on, but will  not ignite.  I have a Honeywell S86F module that I think is bad.

Is your furnace a hot surface or spark ignition. If you have a hot surface igniter you can check it with a multimeter or pull it out and check to see if igniter has a break in it . Check igniter first even if you have a spark igniter. Some brands of furnaces you have to turn off the thermostat to reset. If you need anymore help send me the make and model# of your furnace

Nov 28, 2008 | Heating & Cooling

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