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I have a tr90 having similar problem - 4 blinking lights. Have to reset flame roleout switch. Blower keeps running, blowing cold air until reset. Service man said furnace not sized for our 2800 sq...

I have a tr90 having same problem. 4 blinking lights, reset high limit to get it to ignite. Service man said cause was not enough vents, too small of cold air return and unit was oversized for our...