Heater ignites about 3 times, then shuts off

Old 11-20-15, 07:05 AM
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Heater ignites about 3 times, then shuts off

I have tried to find more than this, but all I can find as of brand is a label on the side. Model # EDD2X36BAT1 , Serial # x063954820.

I read enough to know it could have been the sensor, and lightly sanded the sensor down in case that was the problem but it still continues to do the same thing. The little light begins to glow on the other of the 3 tubes, then the tubes shoot flames into the furnace for a few seconds, and then it stops. This process repeats itself about 3 times, then it shuts itself off altogether. The only manual I could locate I found online, using the information I just gave you. Any help would be appreciated....
Old 11-20-15, 12:45 PM
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The flame sensor is usually a rod about three inches long sticking up into the area where the flame burns, on the side opposit the hot surface ignitor.

It has a single electrical wire going back to the circuit board.

Verify that some part of the flame sensor is engulfed by the burner flames when the furnace lights.

Hope you sanded the right thing!

Use an AC voltmeter to measure the AC voltage being applied to the flame sensor when the hot surface ignitor is warming up. post that here.

Be sure that the wire from the flame sensor is in good condition and attached to the proper connection at the circuit board.

Also, check to be sure that the circuit board has a good ground to the furnace sheet metal. A poor ground will cause the burners to shut off as well.

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