AMERICAN STANDARD PLATINUM 95 FURNACE Error
| CONF | DIAGNOSIS | PART MATCH | ACTION |
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93%
CONF
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Inducer Pressure Switch
The pressure switch contains a sensitive internal diaphragm and a microswitch that confirms the inducer motor is exhausting flue gases. Over time, the diaphragm can stiffen or rupture, or the electrical contacts can develop carbon buildup, preventing the switch from closing even when the proper vacuum is present. Replacing the switch restores the safety circuit's ability to verify airflow before the ignition sequence begins.
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4%
CONF
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Draft Inducer Motor Assembly
The pressure switch is a passive sensor; the inducer motor is the active component that creates the pressure differential. If the motor's bearings are failing or the internal squirrel-cage impeller is clogged with debris, the motor will not reach the necessary RPM to generate the specific 'inches of water column' (WC) required to actuate the switch. This results in a persistent pressure switch error despite the switch itself potentially being functional.
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3%
CONF
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Pressure Switch Tubing and Collector Box Kit
Condensing furnaces produce significant moisture; if the sensing tubing becomes clogged with condensate or the port on the collector box is restricted by scale/sediment, the pressure switch cannot 'see' the vacuum. This pneumatic disconnect causes the control board to sense an open circuit. Replacing the tubing and cleaning the port ensures a clear signal path for the pressure differential.
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DIY Repair Guide
Watch exactly how to replace the Inducer Pressure Switch.