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Rheem corsair. Just replaced control board and now igniter come on , burner lights but doesn't stay lit. Took out flame sensor and sanded and replaced. Still same issue . Is the sensor bad or can i

I did not wire the new control board correctly at first and applied power to it, but nothing happened at that time. Now that it's correctly wired, the above problem persists. Can you give me some ideas what could be going on? BTW had to use an ICM 288 board as my board is no longer available.

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If the sensor does not I.D. a pilot, the furnace would not fire, so your OK to this point. The sensor needs to stay in a flame constantly once the main burners light. Sometimes the draft will cause the flame to waver and cause a shutdown. Also, if the blower fan does not start on time, the furnace will shut down. I would check for wavering first.

Posted on Nov 23, 2013

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Furnance lights and then burner goes out


I'm assuming this is a remote sensor... if so, you need to read the MicroAmps that the flame is generating. If it is anything less than 4, then either the flame is not hitting the sensor enough, or the sensor needs replaced.

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The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

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Will light and remain lit 5min. 30min i dont think its thermocouple thinking something with the safety tilt


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, by cleaning it you have almost restored it to its new condition.
Seldom, but sometimes they do go out completely.

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1 Answer

I have 2 rheem lp gas water heaters side by side and put a new pilot assembly in one but can not get either pilot light to stay lit do you have any ideas. thanks greg Thoms


hey greg. most likely its your flame sensors... right near the burner pan, there will be a 1/8th inch diameter metal rod, that should be positioned to be directly in the pilot flame when the pilot is lit. most likely if they havent totally burnt out, you should be able to clean them up with a piece of heavy grit sanding cloth. cheers

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Your furnace needs a tune-up. MODERN FURNACES REQUIRE REGULAR MAINTENANCE!

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I have a Rheem Classic 80 furnace that would ignite but not stay lit. Cleaned the ignition sensor which was easy to get to and the flame sensor which was under the burner plate and it fired up and stayed lit. The flame sensor was about 6" under the burner plate. Easy to get out, but tough to get back in. Used the old piece of paper shim trick to get the screw to "stick" in the socket and it was much easier to position the screw and get it back where it belonged.

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1 Answer

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

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1 Answer

Empire BF-30-1 Main Burner problem


flame sensor,just take some fine sand and lightly sand,it will be where the flame hits one of the burners,should look like a probe,if this helps please give me a fix ya

Jul 11, 2008 | Empire Heating & Cooling

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