I have a Lennox furnace. Indicates primary/secondary limit switch open

Lennox Furnace Primary Secondary Switch Open. Having issues with a Lennox furnace that shut off over night. Giving a Thermostat is fine I think Contractor's Assistant: Do you plan on doing the work yourself? Customer: If I can Contractor's Assistant: Anything else we should. Not something I can walk you thru over the internet w/o other problems occuring

The limit switch will trip typically when the temperature rise exceeds the range listed on the rating plate However subsequent times when the thermostat calls for heating, the burners light off and then appear to shutdown due to Primary/Secondary limit.

I have a Lennox furnace. Indicates primary/secondary limit switch open

It seemed that the blower was not turning on, so replaced the run cap with new 5MF Can you tell me your complete model and serial number- I can get you the unit information manual. I have a Lennox G40UH-36A-070-07 furnace that seems to have a shutdown problem - Primary/Secondary Limit

I have a Lennox furnace. Indicates primary/secondary limit switch open. Starts to blow (lowest speed) and warms up the rooms Can you tell me your complete model and serial number- I can get you the unit information manual.

My Lennox is saying the primary/secondary limit switch is open. No heat. Looks like a counterflow/down flow G24 which is a VERY nasty furnace to work on According to schematic diagram this should mean that