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Service call that the Gas Furnace was not working again. Upon arrival found Indoor Temperature at 73 Degrees and the system was turned off. Turned system on to test operation. System fires up and operates but then will shut down from the Main Limit Switch at the Heat Exchanger. Tested combustion on system and measured gas pressure. Disassembled unit to access the Blower Motor. Tested Amp Draw on blower motor which was within rating. Blower was drawing 1.1 Amps and is rated for 1.4 Amps. Inspected Blower Wheel for debris or obstructions. Removed Supply Ductwork on top of the Unit to inspect the Heat Exchanger. Found no visible damage or failure points in the heat exchanger tubing.