Lennox Furnace Control Board Fuse

When a valve is unable to open and close properly it can sometimes heat up causing an electrical short that blows a fuse.

Lennox furnace control board fuse.

Im going to show you how to fix this problem with just a screwdriver and maybe 5 3 amp fuses and we will fix the 3 amp short im just making this video for my. Fyi this is really only a temporary fix and you should figure out why your fuse blew in the first place. The most common reason for replacing t. Press and release the limit control switch to rest your lennox furnace.

I turned off the input power and attached terminal r 24 vac power to thermostat and the fuse blew. Earlier it was trying to fire but the ignition rod did not work and the diagnostic led s were alternating. I changed thermostat without turning off power and think i blew fuse. So my thermostat randomly had no power one day and i.

The thermostat where you control temp. I was blowing the 5 amp fuse on the control board for my forced air gas furnace. My furnace is a concord model cg90ub. Your furnace s control board has a separate fuse that protects it from getting too hot.

Electric furnace thermostat control wire. Not any part on blower furnace. This video provides step by step instructions for replacing the control board on lennox furnaces. If you have a gas furnace one of the valves may be failing.

Once you find the control panel lift the panel up and away from the appliance you can set this aside for now. Do you know the model of your lennox thermostat. Cartridge fuse flat blade dual element time delay class rk5 250vac 125vdc 200a 7 1 8 l 1 9 16 dia. Where is fuse location on lennox merit series control board.

House was built in 2004. Examine your furnace and look for a raised button or switch to the right of the ignition control box or the limit control switch. How old is it. I removed all the wires going to my thermostat and it would not blow the fuse when powered on.