Lennox Furnace Control Board Fuse

This video provides step by step instructions for replacing the control board on lennox furnaces.

Lennox furnace control board fuse.

It was a honeywell thermostat. Cartridge fuse flat blade dual element time delay class rk5 250vac 125vdc 200a 7 1 8 l 1 9 16 dia. My lennox 8ouhg3 75a 2 furnace control board isnt working my lennox 8ouhg3 75a 2 furnace control board isn t working and repeatedly popping the 3a fuse. If you have a gas furnace one of the valves may be failing.

Your furnace s control board has a separate fuse that protects it from getting too hot. I removed all the wires going to my thermostat and it would not blow the fuse when powered on. Earlier it was trying to fire but the ignition rod did not work and the diagnostic led s were alternating. Once you find the control panel lift the panel up and away from the appliance you can set this aside for now.

My furnace is a concord model cg90ub. Do you know the model of your lennox thermostat. Where is fuse location on lennox merit series control board. Part number part description part link 11h36 lennox 11h36 control board kit view lennox part 11h36 11k83 lennox 11k83 speed controller tsc5 view lennox part 11k83 11k84 lennox 11k84 speed control tsc6 view lennox part 11k84 12j99 lennox 12j99 integrated furnace control board view lennox part 12j99 12w64 lennox 12w64 integrated.

I turned off the input power and attached terminal r 24 vac power to thermostat and the fuse blew. When a valve is unable to open and close properly it can sometimes heat up causing an electrical short that blows a fuse. House was built in 2004. Electric furnace thermostat control wire.

The most common reason for replacing t. Examine your furnace and look for a raised button or switch to the right of the ignition control box or the limit control switch. So my thermostat randomly had no power one day and i. Not any part on blower furnace.

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. Press and release the limit control switch to rest your lennox furnace. Fyi this is really only a temporary fix and you should figure out why your fuse blew in the first place. The thermostat where you control temp.