Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Honeywell fan&limit stat manual reset control

I am trying to replace the fan&limit stat control,length 8" which has a red button& a white button. the only one i can find has only a white button. can you help please

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  • albert jones Jan 26, 2009

    this is printed on the control. L4064 Fan&Limit Control. 230-240v T70 limit control 4(4) A fan control 7(7)A 2000 V A max L4064 N1082 the red button to re-set. the white button for fan.

  • HVAC TECH 2 May 11, 2010

    I have been researching your problem and have found no listings on the honeywell.com web site. what is the part number on yours the red button you have is it in the center of the wheel with the temp readings. The white button is for fan but have never seen one with a red button. On the back of the cover on the new one does it show a wiring diagram if so is the red button shown in it

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Okay, the red button is a manual reset that is the heat enchanger gets to hot it opens the safety cicruit. The new one does not have the red button so therefore it will automatically reset itself once the temperature of the heat exchanger cools down. Once you install the new one verify the control shuts the unit down. The easiest way for you to do this is to cover the return grilles with a plastic bag with a little tape to hold it to the grille. Then start the heat cycle and observe the furnace operations. There should be a little tab near the 200 degree temp. once it gets to the 12 oclock point the burners should shut down. If it shuts down properly pull plastic bags off returns and satisfy tstat. now turn heat on again and observe what temp the blower comes on

Posted on Jan 28, 2009

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