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Lenox furnace

davezags Member Posts: 2
Have a Lenox pcmu-ld20n133b starts up fine flame comes on runs about 1 minute than everything shuts down. After minute or so starts again as soon as flame comes on within second or 2 everything shuts down. When it shut down the only thing it will do is if I push fan on on limit fan will run nothing else. White Rodgers 50 e-47-070 no flashing lutes either. Any suggestions


  • Tim McElwain
    Tim McElwain Member Posts: 4,596
    Clean the flame rod, check and make sure your ground is stable. Once rod is cleaned measure your microamps should be between 2 to 10 normal around 3 to 5.
  • davezags
    davezags Member Posts: 2
    Thanks for replying. Had a spare new flame rod installed it. Removed grounds sanded reinstalled even removed cleaned screws holding control box to furnace. controller? I don't get no lights except 1 flash when furnace does kick on. No other time.
  • Tim McElwain
    Tim McElwain Member Posts: 4,596
    What are you getting for microamps when it is running? Run a new ground from the flame rod to the gas valve.
  • John Mills_5
    John Mills_5 Member Posts: 950
    That's a Yorkie not a Lennox BTW.