Goodman Furnace Error Code 1 Flash: How to Fix It

Error Code

1 Flash

Brand

Goodman

Product Type

furnace

Severity

Critical

DIY Difficulty

Hard

Estimated Fix Time

1-3 hours

Tools You'll Need

• Phillips screwdriver
• Flathead screwdriver
• Multimeter
• Adjustable wrench
• Gas leak detector solution

How to Fix Error Code 1 Flash

1. Turn off power and gas supply

   Never attempt repairs with gas or power on. If you smell gas, evacuate immediately and call your gas company.

2. Wait for system cooldown

   Hot surfaces can cause burns. Always wait for complete cooldown.

3. Access the gas valve

   Take photos before disconnecting any wires to ensure proper reconnection.

4. Inspect gas valve connections

   Do not overtighten gas connections as this can damage threads and create leaks.

5. Test valve electrical connections

   Only perform electrical testing if you're experienced with multimeters. Incorrect testing can damage components.

6. Replace the gas valve

   Gas valve replacement should only be performed by licensed technicians in most areas due to safety codes.

7. Test system operation

   If the error code persists or you detect any gas odor, shut down immediately and call a professional.

Parts You May Need