Snap a photo — see what it is, how urgent, who to call.
One photo of the problem. fixRAgent reads it and gives you a Triage Profile.
Triage a photo nowNo sign-up.
Usually not an emergency. 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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Managing this for someone else? Managers: set it up for your buildings →
Managing this for someone else? There is a version of this for whole portfolios.
Managers: set it up for your buildings →“Low flame sense signal”
— 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.
In plain words, 8 Flashes is about ignition — the burner did not light, or the control saw a flame signal it did not expect.
Trane gives 4 other ignition and flame codes for this furnace: 2 Flashes (System Lockout (Retries or Recycles exceeded)), 5 Flashes (Flame sensed when no flame should be present), 7 Flashes (Gas valve circuit error), Continuous ON (Replace IFC).
Next to 8 Flashes in Trane’s table: 7 Flashes (Gas valve circuit error) and Continuous ON (Replace IFC).
Safety: If you smell gas, do not touch switches or try to relight anything: leave, and call the gas utility or 911 from outside.
At least THIS WEEK. fixRAgent treats this code as a this-week repair: the appliance has reported a fault, but the code alone does not point at a safety hazard. 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.
HVAC technician. Have the model and serial numbers from the label ready — a photo of the label works.
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.