Error code 02 displayed and furnace inducer motor does not start, no ignition sequence

Safety: Turn off power to the furnace before touching wiring or tubing.

Error 02 typically indicates the pressure switch is detected as closed before the inducer starts.

• Inspect pressure switch tubing:
  • Locate the rubber or silicone tube from the inducer housing to the pressure switch.
  • Remove the tube and check for water, debris, or kinks.
  • Blow gently through the tube to clear any blockage and reinstall firmly.
• Check the pressure switch:
  • With power off, disconnect the wires from the pressure switch terminals.
  • Use a multimeter on continuity: the switch should be open with no suction applied.
  • If it reads closed, the switch is stuck and should be replaced with the correct OEM American Standard pressure switch (match rating in inches W.C.).
• Inspect inducer housing port:
  • Ensure the small port where the tube connects to the inducer is not plugged with rust or debris.
  • Clean gently with a small drill bit or paper clip (do not enlarge the hole).
• If the switch and tubing are good but the board still reads closed, the integrated furnace control may have a stuck input circuit and should be evaluated by a technician.