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intermitent

  1. HVAC
    Have a Gibson, high-efficiency, Model KG6C060C-12 gas furnace. I've had an intermittent (once a month, once every six months) problem. The pre-fire fan comes on, and glow-plug lights, but when the time for the burner to fire, the gas valve clicks, the burner does not fire, and the start-up...
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