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I need to adjust the limit switch on a Lennox heat pump. How to I turn off power to unit before I open the control cover?

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If you mean the ambient lockout switch it shpopuld be oin the outside unit and all that you will need to shut off is the outside condenser before you open the panel. ther is a disconnect that you will have to throw either right by the unit or inside of a main breaker panel.. Hope that this helps and Thanks for using Fixya

Posted on Dec 25, 2008

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When you take the cover off, you are turning power off to the unit. What this is doing is causing a reset to happen. Soumnds like you have a control problem on the unit. Could be a limit switch or safety switch.

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Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

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