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Datton 3E402, rapid cycling ... burner on 42 seconds, then off; then fan on 12 seconds , then off; then cycle repeats. Just started this a few days ago. Thaks, Terrence

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Hi!!! you seem to have a bad flame sensor in your heater.Replace your flame sensor..Good luck..

Posted on Jan 03, 2009

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Outside unit runs for about 5 seconds then shuts off for a few seconds. It repeats this cycle.


Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

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The flame sensor can still be faulty, replacing that is the cheapest. Other issues could be a faulty control board (if available), a faulty gas valve, thermostat lossing call, or a safety/pressure switch problem. There are alot of variables and it really helps to have a meter to check voltage and continuity through-out the system.

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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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2 Answers

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1 Answer

Trane air handler cycling rapidly


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3 Answers

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1 Answer

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1 Answer

The burners go out before the fan comes on


Replace your flame sensor, but before you do that, see if you can clean it with light wool, or emery cloth, or light sand paper. It's a metal rod that points in the current of your flame.

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1 Answer

The burners go out before the fan starts


Replace the flame sensor, clean the burners to ensure you have a good clean burn pattern and the flame is properly reaching the flame sensor.

Look for a flashing LED and determine what the failure code is.

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