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The genuine Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a thermal safety control on your GCH91155DXAC gas furnace. It monitors temperature in the blower or heat-exchanger area and opens the circuit to shut off the burners if the furnace overheats — protecting the heat exchanger and cabinet from heat damage caused by restricted airflow, a dirty filter, or blower failure. A tripped or open auxiliary limit is a common reason a furnace stops heating.
Limit switches are color- and temperature-coded — installing the wrong trip point (a generic or mismatched switch) either nuisance-trips or, worse, fails to protect the furnace. The light-blue 0130F00038 carries Goodman's exact factory temperature rating, so it opens at the correct threshold and keeps the safety chain intact.
Easy (2/5). Disconnect power, note and transfer the wire leads, remove the mounting screws, and install the matching light-blue switch in the same orientation. Never substitute a different color/rating. Restore power and confirm normal heating. Use a licensed HVAC technician if you are unsure about safety-circuit work.