Trane Furnace Error Code 6 Flash: How to Fix It

Q: What does Trane furnace 6 flash error code mean?

The 6 flash error code on a Trane furnace means the 115V power polarity is reversed - the hot and neutral wires are connected backwards. This prevents safe furnace operation and must be corrected immediately.

Q: Is it safe to run my Trane furnace with a 6 flash error?

No, never run your furnace with a 6 flash error. Reversed polarity creates a serious electrical safety hazard that could damage the furnace control board or create fire/shock risks. Turn off the furnace immediately until the polarity issue is resolved.

Q: Can I fix Trane 6 flash error myself?

While technically possible for experienced DIYers, correcting electrical polarity involves working with 115V wiring and should only be attempted if you're comfortable with electrical work. When in doubt, hire a licensed HVAC technician for safety.

Q: What causes reversed polarity in a Trane furnace?

Reversed polarity typically occurs during installation or electrical work when the hot and neutral wires are accidentally swapped. This can happen during furnace installation, electrical panel upgrades, or any work involving the furnace's power connections.

Q: Will a 6 flash error damage my Trane furnace?

Continued operation with reversed polarity can potentially damage the furnace's control board and other electrical components. The furnace safety systems prevent operation to protect the equipment, so address the error promptly to avoid damage.

Abstract

Trane furnace error code 6 flash (also called 6 blink) indicates that your furnace's 115V power wires are connected backwards - the hot and neutral wires are swapped. This is a serious electrical safety issue that prevents your furnace from operating properly and must be corrected immediately.