Question about Heating & Cooling
There are a few different reasons for short cycling of a furnace.
1. Inadequate air flow. Not enough air moving through the furnace can cause it to overheat and trip the high temperature limit switch.
check to see that all registers are open and returns are not blocked.
2 Improper heat anticipator setting on thermostat. Some thermostats have a heat anticipator and too low of a setting can cause short cycling.
4 Partially blocked drain hoses. If the condensate backs up into the furnace it can shut the flame off and then when the condensate drains the furnace starts again. Check all drain hoses to make sure they are clear.
These are just some of the possible reasons for short cycling .
Hope this helps.
Posted on Dec 26, 2013
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Posted on Jan 02, 2017
There is a little switch on the circuit board. Look closely at the wiring diagram and it will indicate which switch to adjust. If not, review the operating manual for details.
Posted on Nov 25, 2008
first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps
Posted on Jan 20, 2009
Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.
Posted on Nov 03, 2009
hi check out the temp rise and fall on the fan control see if he has left the blower in the summer swich postion where it runs all the time
Posted on Feb 12, 2010
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