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

Lennox Furnace Primary Secondary Switch Open. Lennox G51MP Elite Series my furnace is saying the primary The label on the cover states this is either (A) Primary/Secondary limit switch open, OR (B) WatchGuard mode-limit switch open longer than 3 minutes I had a service tech out Friday, but we didn't have the codes (my wife.

Lennox G26 The G26 is a condensing 92% AFUE gas furnace Looks like a counterflow/down flow G24 which is a VERY nasty furnace to work on

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 Gas and Oil Home Heating Furnaces - Primary/Secondary limit switch open for Lennox G26Q2-50-4 - My furnace was blowing cold air so I looked the diagnostic light to determine that it was displaying the primary/secondary limit switch open message I have checked primary, secondary, roll outs, and pressure switches for continuity and all are good

My Lennox is saying the primary/secondary limit switch is open. No heat. I have checked primary, secondary, roll outs, and pressure switches for continuity and all are good No heat Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters? Customer: Just changed the filter and it was pretty bad

I have a Lennox 80UHG4/5X furnace and I am getting a primary/secondary. Starts to blow (lowest speed) and warms up the rooms If I reset it, it works for some time (30 min ~ couple of hours) and then goes off