Web Reference: Dec 10, 2024 · Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has two pressure switches (1LP & 2LP) - a higher pressure switch to monitor the negative pressure at the inducer motor, and a lower pressure switch to monitor for a clogged drain at the bottom of the collector box. The 3-flash error indicates the pressure switch isn’t opening, causing no hot water. Even after replacing the pressure switch, check the venting system for blockages restricting airflow. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
YouTube Excerpt: It's a three flash error
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