Goodman Furnace Error Code 1: How to Fix It

Q: What does Goodman furnace error code 1 mean?

Error code 1 indicates an external lockout due to too many failed ignition attempts. The furnace shuts down to protect itself when it can't light properly.

Q: How do I reset my Goodman furnace after error code 1?

Turn off the furnace at the circuit breaker and gas valve, wait 5 minutes, then turn them back on. Then cycle the thermostat off and on to reset.

Q: Can a dirty flame sensor cause error code 1?

Yes, a dirty flame sensor is a common cause. Cleaning it often resolves the issue.

Q: Why does my Goodman furnace keep going into lockout?

Repeated lockouts may be due to a faulty ignitor, gas supply problem, or a blocked air intake/flue. It could also indicate a more serious control board issue.

Q: Is it safe to run my furnace with error code 1?

No, the furnace is locked out for safety. Attempting to bypass the lockout can cause carbon monoxide buildup or fire hazards. Troubleshoot or call a pro.

Abstract

Goodman furnace error code 1 indicates an external lockout caused by too many failed ignition attempts. This usually happens when the furnace tries to light but fails repeatedly, then locks out to prevent damage. Common causes include a dirty flame sensor, gas supply issues, or ignition problems.