Furnace does not ignite; inducer motor does not start and E03 is shown.

Safety: Turn off power and gas. Do not operate the furnace with the venting system disassembled.

• Check venting: Inspect the PVC or metal vent and intake pipes connected to the Wolf furnace. Look for snow, leaves, bird nests, or other obstructions at the terminations. Clear any blockage.
• Inspect inducer motor: Remove the upper access panel. Locate the inducer assembly (small blower connected to the flue). Spin the inducer wheel by hand; it should turn freely without grinding. If seized or noisy, the inducer motor is likely failed and must be replaced.
• Pressure switch and tubing: Locate the round pressure switch connected to the inducer housing by rubber tubing. Ensure tubing is not cracked, kinked, or filled with water. Replace tubing if brittle. Gently blow through the tubing to clear debris (with power off).
• Test operation: Restore power and call for heat. If the inducer does not start at all, check for 120V at the inducer motor leads during a call for heat (qualified persons only). If voltage is present but the motor does not run, replace the Wolf inducer motor assembly. If no voltage, the control board or safety chain may be at fault and should be professionally diagnosed.