Error code

Trane furnace error code 6 Flashes

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Is 6 Flashes on a Trane furnace an emergency?

Treat it as urgent — deal with it today. If you smell gas, do not touch switches or try to relight anything: leave, and call the gas utility or 911 from outside.

Take the photo. We’ll tell you what it is.

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What 6 Flashes means

“115 Volt AC power reversed or Poor Grounding”

— Trane, Trane Installer's Guide 18-CD29D1-14-EN, Integrated Furnace Control error flash codes. Codes vary by model: check your furnace’s own manual.

Where 6 Flashes fits

In plain words, 6 Flashes is about the power supply or wiring — voltage out of range, a blown fuse, or a wiring fault.

Trane gives one other power and wiring code for this furnace: Continuous OFF (Check Power).

Next to 6 Flashes in Trane’s table: 5 Flashes (Flame sensed when no flame should be present) and 7 Flashes (Gas valve circuit error).

What to try first

  • Call an HVAC technician or electrician to check the wiring.

Safety: If you smell gas, do not touch switches or try to relight anything: leave, and call the gas utility or 911 from outside.

How urgent is it?

At least TODAY. fixRAgent treats this code as needing attention today. It points at water where it should not be, overheating, a combustion or ignition safety shutdown, food that may be warming, or a wiring problem. This is fixRAgent’s reading, not the manufacturer’s. A photo can raise it — water near wiring, scorch marks, a gas smell — but a code never lowers what the photo shows.

Who to call

HVAC technician. Have the model and serial numbers from the label ready — a photo of the label works.

Recalls and manuals

Check whether your model is under a safety recall on the U.S. Consumer Product Safety Commission’s site: cpsc.gov/Recalls. Your owner’s manual is on Trane’s support site; search it with the model number from the label.