Goodman Furnace Error Code 4: How to Fix It

Q: What does error code 4 mean on a Goodman furnace?

Error code 4 means the furnace has an ignition control fault, usually caused by failure to ignite or a lost flame during operation.

Q: Can I reset my Goodman furnace after error code 4?

Yes, press the red reset button on the furnace. Wait 30 minutes before resetting to allow the system to cool down. If the error persists, the problem needs further diagnosis.

Q: How do I clean the flame sensor on a Goodman furnace?

Turn off power and gas, remove the sensor (usually one screw), and gently rub the metal rod with fine-grit sandpaper or emery cloth. Reinstall and test.

Q: Is error code 4 serious?

It is moderately serious because the furnace won't heat. However, it is often fixable with simple steps like cleaning the flame sensor. However, it can indicate a gas supply or control board issue needing professional help.

Q: How much does it cost to fix Goodman error code 4?

DIY costs are minimal (e.g., sandpaper). If you need a technician, expect $150-$300 for service call and parts (igniter $20-$50, flame sensor $15-$30, control board $150-$400).

Abstract

Error code 4 on a Goodman furnace indicates an ignition control fault, meaning the furnace has failed to ignite or lost flame during operation. This is a common issue that can often be resolved by checking the gas supply, igniter, and flame sensor.