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Would I be able to test that by disconnecting the vacuum hose? In my earlier testing I disconnected it with the same result. In any case, I'll go to the basement and start looking at the vent. Thanks much! Aaron

I have a Trane XE90 with a problem. The LED flashes like normal when it gets a call for heat, the glow plug warms up, the gas relay opens, gas flows to the burners, the burners light for a couple seconds then turn off. I've replaced the flame sensor and installed a refurbished control board thus...