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Flame sensor dirty - Heating & Cooling

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Do not use sand paper to clean it use rubbing alcohol and a clean rag sand paper could damage it and then you will have to replace it for sure but if the rubbing doesn't work you will any way but in most of my experiences it has worked

Posted on Nov 04, 2012

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A flame sensor simply "senses" a DC rectified signal from the AC spark being passed through a flame(the pilot) thus proving a pilot flame exists via "flame rectification" and its just microamps as the fire isnt a good conductor, but it will conduct enough for this use, try wiring some 105 degree celcius wire from the pilot assembly to the ground or sense on the ignition module, flame sensors do not go bad or wear out, they get dirty, but that is never the issue from my experience, sensing the DC via
ground or ground rod/sensor is easily disrupted by corosion even moisture.There are flame simulators to test with as well.

Oct 31, 2012 | Heating & Cooling

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Heater starts runs for a short time then shuts down and shows flame defalt turn it off and it will relight breifly then shut off agian i have new filters and nozle and air presure is at 5psi

Must be a dirty sensor. Some models have a spark/sensor. others have a flame sensor.
All auto lighting devices have some sort of sensor. Yours is either dirty or bad.
Kerosene heaters sometimes clog when diesel fuel is used as an alternative, sensors get dirty and such. You would get a much mo betta answer if you posted your actual make and model number as well as type of heater with type of fuel.

Oct 20, 2011 | Heating & Cooling

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Gas shuts off after 2 min, then re-ignights for 2 min, etc, etc.

Dirty pilot, bad flame sensor or dirty flame sensor. Check the exhaust blower to make sure it is turning.

Mar 06, 2011 | Heating & Cooling

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Heat come on for 30sec. then goes off

If this is for your furnace your flame sensor is probably dirty. Your flame sensor is a rod that sits on the end of your burners to make sure all furnace jets fire if it is dirty it will cycle offf and on fore 3 or 4 tries then lock itself out. what you will need to do is use a piece of sand paper or steel wool and clean the flame rod sensor but be careful because the end of the flame sensor is porcelin and breaks easily. If this help please rate me and do a testimonial.

Dec 28, 2010 | Weather King 10AJA3601AH Air Conditioner

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Gas man is checking my pool heater. When starting up the burner lights then goes out. What could be causing this?

Often that is because of a bad or dirty flame sensor...The flame passes a current through the flame and theat proves that there is flame... if the flame is not hitting the sensor or it is dirty it will not pass the current through... also check that the burner ground is not corroded or loose...

These can be a bugger to fix...
and sometimes it turns out to be a bad sensor or a bad ignition module...


Sep 03, 2010 | Jandy Laars Lite2 Ld 400,000 Btu Heater

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Water heater will light but only stays lit for about 5 seconds then shuts off

sounds like the flame sensor isn't detecting the flame. It could be dirty or broken.

It's normally dirty so that could be fixed easily. Look in your owners manual to see where the flame sensor is (it usually looks like a metal rod with a bend on the end and just one wire coming out the bottom).

Turn off the power, remove the sensor, clean it with emery cloth and replace it, turn on and if that was the problem it should work just fine now.

Jun 24, 2010 | RTO Atwood Water Heater - 6 Gal LP

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Goodman Dependable 92, ignitor and fan comes on for 3 seconds, furnance does not turn on. Goes through 3-4 cycles, then shuts down furnance. If it is the flame sensor, where can one buy parts?

Do the burners come on? If so then yes it probably is the flame sensor if not then there is another issue not the flame sensor. The flame sensor could just be dirty take the flame sensor out and clean it with a piece of emery cloth or lite sand paper and put it back in and this should get the burners to stay on.

Feb 05, 2010 | Goodman GMS90703BXA Heater

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I have a ruud 90 plus achiever gas horizontal furnace. the unit will run once i turn the thermostat off then on. it will cycle a few times go off and then will not come on. any suggestions?

Sounds like it could be a dirty or bad flame sensor.
When the burner lights ,there is a flame sensor in the flame and it is suppose to sense the flame and send a signal back to the control board which will keep the gas valve open, if it gets dirty or is bad it doesn't send the signal back to the board and the board will shut the gas valve off and after three tries it will lock out the furnace and you have to reset it to get it to work again.
The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
You can clean this sensor with an extra fine piece of steel wool, but before you attempt to do this DISCONNECT ALL POWER TO THE FURNACE.

Jan 04, 2010 | Ruud UBHC Air Conditioner

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Burner fires when calls for heat, runs for 5 seconds kicks off changed flame sensor still same problem

make sure the flame sensor is connected good. If the terminals are dirty or corroded the board will not get the proper millivolt reading from the sensor. Also, remove the flame sensor and take emery cloth and clean the point where the flame sensor attaches to ensure a good contact point there.

Oct 01, 2009 | Heating & Cooling

1 Answer

Flashing amber lights

it means that the flame sensor is not sensing a flame. If the flame is present and nice and blue the flame sensor is probaly dirty. Remove the flame sensor and lighty sand it with sandpaper.

Dec 25, 2008 | Ruud UBHC Air Conditioner

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