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Dayton gas heater mod 3E404

Fan run all the time ...will not light burner

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This is an easily fixed problem. There are two thermistor switches on Dayton furnaces. One controls the fan motor run function and the heater valve on/off function. The other called a blocked vent switch (located in the top front of the heater) stops the gas valve from opening in the event the
vent is plugged. However, if the furnace was totally shut down for the summer and is now being fired up for winter, the block vent switch has to be reset. The switch has a reset button on it, push it and it should solve your problem. Also, check to make sure the fan run thermistor is clean and does not have debris around it as that acts a insulator for heat to keep the fan run function on.

Posted on Nov 26, 2008

  • Gary Harper Oct 07, 2012

    Were is the switch located at


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It sounds like you have a couple of problems.

1. fan run all the time. I am sure is your fan delay module.
2. will not light. That would be the gas valve.

call they can help

Posted on Mar 02, 2008


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