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The Goodman B1370107 Air Pressure Switch is the genuine OEM safety switch for GUN060-3 gas furnaces, rated at -1.4 in. WC, normally open (NO). It verifies that the inducer/draft blower is producing adequate combustion airflow before the furnace allows ignition. If the switch fails or the vent is blocked, the furnace locks out on a pressure fault and will not light — a classic no-heat safety condition.
The genuine Goodman OEM switch is calibrated to the exact -1.4 in. WC trip point your furnace's control sequence requires. Substituting a generic switch with a different set point can cause nuisance lockouts or, worse, allow ignition without proper venting. Because this is a combustion safety device, OEM calibration is essential.
Rating: Easy. Typically 15–20 minutes. Shut off furnace power, disconnect the two spade terminals, remove the tubing from the port, and unscrew the switch from its bracket. Reverse to install, making sure the pressure tube seats fully without kinks. Confirm the furnace fires normally after replacement.