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  1. HVAC
    Hi All, I have a Lennox 80MGF3/4-100A-1 with a White-Rodgers 36E36-278 Gas Valve. The furnace has been frequently going into WatchGuard mode since the burners fail to ignite. I cleaned the flame sensor and it functioned normally for a few weeks then started having the same issue. I would turn...
  2. HVAC
    My Lennox G40UH-36A-070-03 furnace if giving me trouble recently. Over the past two weeks, it has ended up in Watchguard mode: A: Burners failed to ignite B: Limit open more than 3 minutes C: Lost flame sense 5 times in one heating cycle D: Pressure switch opened 5 times in one heating cycle...
  3. HVAC
    Hi All, I am having some trouble with a Lennox Merit series furnace. At times, it runs fine, and sometimes it won't successfully run. To fix it, I turn off the power to the furnace, wait five seconds and power it back on, and it then runs for a random amount of time before I have to do it...
1-3 of 3 Results