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I have a Ruud electronic ignition gas furnace that is not heating. The ignitor comes on (glows bright red) but I assume the gas never kicks on because the ignitor goes out and the heat doesn't come on. Any recommendations?

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  • carl carpenter
    carl carpenter May 11, 2010

    check and make sure the gas is on, also check the on/off swich on the gas valve.

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Check for 24 volts to gas valve if its there you have a bad gas valve or no gas supply(valve shut off somewhere)

Posted on Aug 29, 2009

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Furnace ignitor comes on glows little red gas comes on doesnt ignite gas shuts off ignitor comes back on glows bright orange gas comes on and ignites. It started doing this right after I replaced the...


Check your conection off the board to the initor and make sure the pins in the plug are set tight with the connection on the board. If you wire nutted the wiring together for the new ignitor you installed check these connection also. Make sure all wire strands at the wire nuts are in the wire nut and not touching or arching on the furances cabinate.

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Have a ruud achiever 90 plus furnace. the flame goes out after the igniter quits. any ideas


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

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This is what we call a "delayed ignition",(gas is not being ignited right away), gas builds up in the chamber and then lights causing a boom. The cause of this problem could be from having dirty burners or ignitor not position to ignite the gas right away or your ignitor may not being glowing enough to ignite the gas being released, check all, Good luck.

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I have the same Ruud Achiever unit & it's not working.


It sounds like it will need a hot surface igniter. This is the part that glows when furnace is turned on, and tells gas valve to release gas for it to ignite. At that point funace is lit, it heats up flame sensor witch inturn tells fan to start.

Sep 30, 2009 | Ruud UBHC Air Conditioner

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In order to diagnose your problem, you will need to set your therm on emergency heat only, watch the cycle in your furnace, and tell me what it does once it tries, and how many times it try's and what it does once it's tried and stopped?

Dec 06, 2008 | Ruud UBHC Air Conditioner

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No ignition


Yes. Gas ignitors either spark or glow. Find a way to look at the ignitor, even if you have to use a mirror. If it sparks or glows, figure out why the gas isn't getting into contact with the ignitor. If it doesn't spark or glow, the ignitor is probably bad, but the controller might not be sending it electricity (bad controller). This is what electrical meters are for. Checking for voltage at the ignitor will tell you if the controller is telling it to ignite.

Jul 22, 2008 | Goodman Heating & Cooling

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