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View Full Version : Furnace runs with door off but dies when door on

natester44
Oct 7, 2013, 07:20 PM
Why is it that my Rheem 90 plus won't run when the top panel door is on but lights and blows when off?
ma0641
Oct 7, 2013, 08:19 PM
Sounds like the safety is crossed. Check to see if micro switch is connected to the NO terminal. Worse case connect the 2 wires.