The Pressure Sensor on the Bryant Furnace Will Not Open or Close & Code 31


Many Bryant furnaces have an electronic control panel that will flash in a series of blinks to notify users if a problem has occurred with the furnace. If the series of blinks equals a code “31” by performing one long flash and then three short ones, the pressure switch is not opening and closing correctly and troubleshooting is needed. Always disconnect the power before performing any cleaning or maintenance tasks and stop immediately if you smell gas. Leave the house and call the gas company for assistance.

Things You'll Need

  • Soft brush or cloth
  • Dishwashing liquid
  • Compressed air
  • Turn off the furnace and open the access panel. Use a soft brush or cloth to clean out debris from the blower fan and the burner assembly but remember to avoid the burner itself.

  • Slide out the air filter and clean if dirty or clogged. Wash with soapy water and rinse thoroughly. Set aside to air dry before reinstalling back into the furnace.

  • Check the air flow around the furnace and remove anything that might be blocking the vents on the furnace sides. Find the return and supply vents throughout the home and open all vents, moving anything that is sitting on top of or blocking the vents and limiting air flow, which can affect the pressure switch.

  • Go outside and check the air vents on the exterior of the home, cleaning as needed to improve air flow through the vents.

  • Find the set of PVC pipes that connect to the furnace combustion chamber as the pipes may be clogged with an object or debris, causing the pressure problem. Use a flashlight to look inside the pipes and remove any items that may be causing the obstruction.

  • Find the pressure switch on the front of the Bryant furnace. The switch is disc-shaped and is inside the front access panel. Disconnect the two hoses connected to the pressure switch and use a can of compressed air to blow out any blockages from the hoses. Reconnect each hose and tap the pressure switch firmly.

  • Perform a reset by disconnecting power and waiting a few minutes before restoring power. Set the thermostat to “Heat” and adjust the temperature to the desired point and allow the furnace to start.

Tips & Warnings

  • Contact Bryant if the error code persists, as the pressure switch may need to be replaced.

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