Wireing diagram for lennox G8R furnace - Emerson Lennox Ducane Armstrong Furnace Blower Motor K55hxkpy-9740

The thermostat wire is shorted. Somewhere between the thermostat and furnace. Replace the wire and make sure its connected correctly. This is an older furnace. Not sure what the thermostat wire connections to the furnace look like. Sometimes if one of the wires touches a ground this could happen. So, start by completely replacing the thermostat wiring.

Might try posting to a furnace category.

That sounds normal. When the bonnet reaches a preset temperature the burner turns off then when it cools down a bit the burner turns back on. Clean filters etc will help to keep the burner on longer in a cycle.

Here you are.

Can you supply more information? Lennox has no record of this number in its current records or archives. Please be sure the number is correct. What type of equipment is it? Furnace, AC, IAQ, control?

http://www.armstrongair.com/armstrong-links/

from here select the particular furnace that you have this is the only resource the is avail. due to the furnace being a Lennox made furnace

At tstat press options. Press installer setup. Yes, you are qualified. System settings, non heat pump. Gas/ oil heat. Save changes. That should do it with no wiring changes.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

change the filter.