Goodman HVAC Error Code 3

Fault code 3 on a Goodman furnace means the inducer end switch is detected as closed while the inducer motor is not running. This indicates the switch is stuck closed or has failed. The furnace will not attempt ignition while this fault is active. The end switch and its associated wiring and pressure hose should be inspected first.

The furnace control board prevents ignition when fault code 3 is active, so there is no immediate combustion risk while the lockout is in place. However, the underlying fault means a critical pressure safety switch is not functioning correctly. The system should not be bypassed or forced into operation until the root cause is identified and corrected.

A power reset may temporarily clear the fault code display, but if the end switch remains stuck closed, the fault will return immediately when the control board runs its startup checks. A reset does not fix the underlying mechanical or electrical problem. Permanent resolution requires diagnosing and repairing the failed component causing the switch to read closed without the inducer running.

Inspecting the pressure sensing hose for kinks or blockages is a task many homeowners and DIYers can perform safely with the unit powered down. However, testing the end switch with a multimeter and replacing it requires some familiarity with electrical components and furnace disassembly. If you are not comfortable working with HVAC electrical components, a qualified technician should handle the repair.

If only the pressure sensing hose needs clearing or repositioning, costs are minimal and may only involve a service call fee, typically in the range of $75 to $150. Replacing the end switch itself usually brings parts and labor costs to somewhere between $150 and $350 depending on the specific model and local labor rates. A faulty control board, if that is the root cause, can increase costs significantly, often ranging from $300 to $600 or more.